{"title":"Optics - Bi-Concave Lenses","description":"\u003cp\u003eBrowse 26+ lenses from WaveQuanta's catalog. Part of our precision optical components and lenses range. Detailed specifications, datasheets, and 3D models available for each product. Request a quote today.\u003c\/p\u003e","products":[{"product_id":"double-concave-lens-n-bk7-ar-coating-400-nm-700-nm-mbcc10612-a","title":"Double-concave Lens, N-BK7, AR Coating: 400 nm-700 nm MBCC10612-A","description":"\u003ch2\u003eDouble-concave Lens, N-BK7, AR Coating: 400 nm-700 nm — Model MBCC10612-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -75.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. These lenses are commonly used for beam collimation, focal length adjustment, or image reduction\/magnification. LBTEK offers double-concave lenses made from N-BK7, one of the most widely used optical glasses for high-quality components, suitable for applications in the visible and near-infrared regions. In addition to N-BK7, LBTEK also provides N-SF11 double-concave lenses, which, due to their lower Abbe number, are typically used in designs requiring shorter focal lengths. To meet different system requirements, LBTEK supplies both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured and subject to strict quality control, ensuring that LBTEK delivers reliable, high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave Lens, N-BK7, AR Coating: 400 nm-700 nm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003cli\u003ePre-installed Mechanical Housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in the visible and near-infrared spectral ranges. All LBTEK circular lenses come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model numbers, types, diameters, and focal lengths for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912039578,"sku":"MBCC10612-A","price":66.76,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm-FuSM3gUZtLhEmghX7T_C-u5On3ah.jpg?v=1772671089"},{"product_id":"double-concave-lens-n-bk7-ar-coating-400-nm-700-nm-mbcc10610-a","title":"Double-concave Lens, N-BK7, AR Coating: 400 nm-700 nm MBCC10610-A","description":"\u003ch2\u003eDouble-concave Lens, N-BK7, AR Coating: 400 nm-700 nm — Model MBCC10610-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -50.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. These lenses are commonly used for beam collimation, focal length adjustment, or image reduction\/magnification. LBTEK offers double-concave lenses made from N-BK7, one of the most widely used optical glasses for high-quality components, suitable for applications in the visible and near-infrared regions. In addition to N-BK7, LBTEK also provides N-SF11 double-concave lenses, which, due to their lower Abbe number, are typically used in designs requiring shorter focal lengths. To meet different system requirements, LBTEK supplies both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured and subject to strict quality control, ensuring that LBTEK delivers reliable, high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave Lens, N-BK7, AR Coating: 400 nm-700 nm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003cli\u003ePre-installed Mechanical Housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in the visible and near-infrared spectral ranges. All LBTEK circular lenses come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model numbers, types, diameters, and focal lengths for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912137882,"sku":"MBCC10610-A","price":64.9,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm-FuSM3gUZtLhEmghX7T_C-u5On3ah_028c9dbc-d887-46b3-bae8-d4cbd005de95.jpg?v=1772671095"},{"product_id":"double-concave-lens-n-bk7-ar-coating-400-nm-700-nm-bcc10613-a","title":"Double-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted BCC10613-A","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted — Model BCC10613-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -100.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. These lenses are commonly used for beam collimation, focal length adjustment, or image reduction\/magnification. LBTEK offers double-concave lenses made from N-BK7, one of the most widely used optical glasses for high-quality components, suitable for applications in the visible and near-infrared regions. In addition to N-BK7, LBTEK also provides N-SF11 double-concave lenses, which, due to their lower Abbe number, are typically used in designs requiring shorter focal lengths. To meet different system requirements, LBTEK supplies both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured and subject to strict quality control, ensuring that LBTEK delivers reliable, high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK doube-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in visible and near-infrared fields. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can choose the optimal mounting method for different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912170650,"sku":"BCC10613-A","price":48.15,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FkdONGD_e4qJa0XOotwvG_XoKyiL.jpg?v=1772671100"},{"product_id":"double-concave-lens-n-bk7-ar-coating-400-nm-700-nm-bcc10612-a","title":"Double-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted BCC10612-A","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted — Model BCC10612-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -75.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. These lenses are commonly used for beam collimation, focal length adjustment, or image reduction\/magnification. LBTEK offers double-concave lenses made from N-BK7, one of the most widely used optical glasses for high-quality components, suitable for applications in the visible and near-infrared regions. In addition to N-BK7, LBTEK also provides N-SF11 double-concave lenses, which, due to their lower Abbe number, are typically used in designs requiring shorter focal lengths. To meet different system requirements, LBTEK supplies both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured and subject to strict quality control, ensuring that LBTEK delivers reliable, high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK doube-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in visible and near-infrared fields. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can choose the optimal mounting method for different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912268954,"sku":"BCC10612-A","price":49.65,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FkdONGD_e4qJa0XOotwvG_XoKyiL_f711496d-af0a-413e-846c-3207d36a4189.jpg?v=1772671105"},{"product_id":"double-concave-lens-n-bk7-ar-coating-400-nm-700-nm-bcc10610-a","title":"Double-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted BCC10610-A","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted — Model BCC10610-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -50.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. These lenses are commonly used for beam collimation, focal length adjustment, or image reduction\/magnification. LBTEK offers double-concave lenses made from N-BK7, one of the most widely used optical glasses for high-quality components, suitable for applications in the visible and near-infrared regions. In addition to N-BK7, LBTEK also provides N-SF11 double-concave lenses, which, due to their lower Abbe number, are typically used in designs requiring shorter focal lengths. To meet different system requirements, LBTEK supplies both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured and subject to strict quality control, ensuring that LBTEK delivers reliable, high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, AR Coating: 400 nm-700 nm, Unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK doube-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in visible and near-infrared fields. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can choose the optimal mounting method for different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912367258,"sku":"BCC10610-A","price":49.65,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FkdONGD_e4qJa0XOotwvG_XoKyiL_f87f2de5-b328-4d75-85c2-b8c76ca8a178.jpg?v=1772671110"},{"product_id":"double-concave-lens-n-sf11-uncoated-420-nm-2-3-μm-mbcc30605","title":"Double-concave lens, N-SF11, AR coating: 420 nm-2.3 μm MBCC30605","description":"\u003ch2\u003eDouble-concave lens, N-SF11, AR coating: 420 nm-2.3 μm — Model MBCC30605\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 420 nm- 2.3 μm, focal length -25.0 mm, Ø25.4 mm, substrate N-SF11.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 420 nm-2.3 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, N-SF11, AR coating: 420 nm-2.3 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 420 nm-2.3 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003cli\u003ePre-installed mechanical housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. The surfaces of these mechanical components.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912400026,"sku":"MBCC30605","price":60.06,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-SF11_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A420_20nm-2.3_20_CE_BCm-Fi455vJO3h3jH1NUiaCdOh0J7vgK.jpg?v=1772671115"},{"product_id":"double-concave-lens-n-sf11-uncoated-420-nm-2-3-μm-bcc30605","title":"Double-concave lens, N-SF11, AR coating: 420 nm-2.3 μm, unmounted BCC30605","description":"\u003ch2\u003eDouble-concave lens, N-SF11, AR coating: 420 nm-2.3 μm, unmounted — Model BCC30605\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 420 nm- 2.3 μm, focal length -25.0 mm, Ø25.4 mm, substrate N-SF11.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 420 nm-2.3 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, N-SF11, AR coating: 420 nm-2.3 μm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 420 nm-2300 nm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can select the optimal mounting method based on different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912498330,"sku":"BCC30605","price":45.93,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-SF11_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A420_20nm-2.3_20_CE_BCm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FlxwoD0pv7DHr-mQRKmqlnxl2.jpg?v=1772671122"},{"product_id":"double-concave-lens-n-sf11-ar-coating-400-nm-700-nm-mbcc30605-a","title":"Double-concave lens, N-SF11, AR coating: 400 nm-700 nm MBCC30605-A","description":"\u003ch2\u003eDouble-concave lens, N-SF11, AR coating: 400 nm-700 nm — Model MBCC30605-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -25.0 mm, Ø25.4 mm, substrate N-SF11.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, N-SF11, AR coating: 400 nm-700 nm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK biconcave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length on the housing for easy identification.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912563866,"sku":"MBCC30605-A","price":65.08,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-SF11_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm-FqmwGqTxib8SBbTnveivZB9ajgG0.jpg?v=1772671126"},{"product_id":"double-concave-lens-n-sf11-ar-coating-400-nm-700-nm-bcc30605-a","title":"Double-concave lens, N-SF11, AR coating: 400 nm-700 nm, unmounted BCC30605-A","description":"\u003ch2\u003eDouble-concave lens, N-SF11, AR coating: 400 nm-700 nm, unmounted — Model BCC30605-A\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 400 nm-700 nm, focal length -25.0 mm, Ø25.4 mm, substrate N-SF11.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, N-SF11, AR coating: 400 nm-700 nm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 400 nm-700 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAddress：Building A6, Huanchuang Enterprise Plaza, Yuelu Idstrict, Changsha\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912629402,"sku":"BCC30605-A","price":59.69,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-SF11_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A400_20nm-700_20nm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-Flmqp_ck8VFlMiHJRNLxskDTVBvT.jpg?v=1772671131"},{"product_id":"double-concave-lens-n-bk7-uncoated-350-nm-2-0-μm-mbcc10610","title":"Double-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm MBCC10610","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm — Model MBCC10610\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 350 nm-2.0 μm, focal length -50.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 350 nm-2.0 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDouble-concave lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. They are typically used for beam collimation, focal length adjustment, or image reduction\/expansion.\n\nN-BK7 is one of the most commonly used optical materials, well-suited for applications in the visible and near-infrared spectral ranges. LBTEK manufactures a wide range of double-concave lenses from N-BK7 for general-purpose use. In addition, LBTEK also offers double-concave lenses made from N-SF11. With its lower Abbe number, N-SF11 is often used to produce lenses with shorter focal lengths.\n\nLBTEK provides uncoated double-concave lenses as well as AR-coated versions optimized for three wavelength ranges: 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured under strict quality control, ensuring that LBTEK delivers high-quality products at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 350 nm-2000 nm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003cli\u003ePre-installed Mechanical Housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in the visible and near-infrared spectral ranges. All LBTEK circular lenses come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model numbers, types, diameters, and focal lengths for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912727706,"sku":"MBCC10610","price":51.7,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E6_9C_AA_E9_95_80_E8_86_9C_EF_BC_9A350_20nm-2.0_20_CE_BCm-FjmFRdKWLXsNspomHBuvM3K_kuPo.jpg?v=1772671136"},{"product_id":"double-concave-lens-n-bk7-uncoated-350-nm-2-0-μm-bcc10610","title":"Double-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm, Unmounted BCC10610","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm, Unmounted — Model BCC10610\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 350 nm-2.0 μm, focal length -50.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 350 nm-2.0 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDouble-concave lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. They are typically used for beam collimation, focal length adjustment, or image reduction\/expansion.\n\nN-BK7 is one of the most commonly used optical materials, well-suited for applications in the visible and near-infrared spectral ranges. LBTEK manufactures a wide range of double-concave lenses from N-BK7 for general-purpose use. In addition, LBTEK also offers double-concave lenses made from N-SF11. With its lower Abbe number, N-SF11 is often used to produce lenses with shorter focal lengths.\n\nLBTEK provides uncoated double-concave lenses as well as AR-coated versions optimized for three wavelength ranges: 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured under strict quality control, ensuring that LBTEK delivers high-quality products at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm, Unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 350 nm-2000 nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in visible and near-infrared fields. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can choose the optimal mounting method for different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912760474,"sku":"BCC10610","price":36.07,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E6_9C_AA_E9_95_80_E8_86_9C_EF_BC_9A350_20nm-2.0_20_CE_BCm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FukN-PDFr92QkglXKWYf40VZqR.jpg?v=1772671142"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-mbcc70617","title":"Double-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm MBCC70617","description":"\u003ch2\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm — Model MBCC70617\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -200.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912858778,"sku":"MBCC70617","price":261.8,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/CAF2_201-1-Fs9zepGAh4IXmWKxXwG_gCLheLZ1.jpg?v=1772671147"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-mbcc70613","title":"Double-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm MBCC70613","description":"\u003ch2\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm — Model MBCC70613\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -100.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517912957082,"sku":"MBCC70613","price":261.8,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/CAF2_201-1-Fs9zepGAh4IXmWKxXwG_gCLheLZ1_c5d90650-69e7-49cb-a7bf-139a0f7f841d.jpg?v=1772671152"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-mbcc70612","title":"Double-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm MBCC70612","description":"\u003ch2\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm — Model MBCC70612\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -75.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517913022618,"sku":"MBCC70612","price":261.8,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/CAF2_201-1-Fs9zepGAh4IXmWKxXwG_gCLheLZ1_5ed8d35a-4b04-4135-bfa9-f92d53c64d65.jpg?v=1772671157"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-mbcc70610","title":"Double-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm MBCC70610","description":"\u003ch2\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm — Model MBCC70610\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -50.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517913088154,"sku":"MBCC70610","price":261.8,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/CAF2_201-1-Fs9zepGAh4IXmWKxXwG_gCLheLZ1_a6391cfa-3bc2-43c8-9abf-98d966e86b24.jpg?v=1772671162"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-mbcc70607","title":"Double-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm MBCC70607","description":"\u003ch2\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm — Model MBCC70607\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -30.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, CaF2, Uncoated: 200 nm-8.0 μm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517913186458,"sku":"MBCC70607","price":261.8,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/CAF2_201-1-Fs9zepGAh4IXmWKxXwG_gCLheLZ1_358ba48a-9e6a-4627-ae99-e4a243b724f2.jpg?v=1772671168"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-bcc70617","title":"Double-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted BCC70617","description":"\u003ch2\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted — Model BCC70617\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -200.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517913284762,"sku":"BCC70617","price":249.16,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1-FgEGAhfOa8k7Wbio0na8frV-F0mG.jpg?v=1772671174"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-bcc70613","title":"Double-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted BCC70613","description":"\u003ch2\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted — Model BCC70613\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -100.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517913350298,"sku":"BCC70613","price":249.16,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1-FgEGAhfOa8k7Wbio0na8frV-F0mG_469db8d6-b8a4-4f62-80bc-70ba46c67f8a.jpg?v=1772671179"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-bcc70612","title":"Double-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted BCC70612","description":"\u003ch2\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted — Model BCC70612\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -75.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517913415834,"sku":"BCC70612","price":249.16,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1-FgEGAhfOa8k7Wbio0na8frV-F0mG_444a75bd-637b-48b6-bde9-ac4f7a3f34c0.jpg?v=1772671184"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-bcc70610-1","title":"Double-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted BCC70610","description":"\u003ch2\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted — Model BCC70610\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -50.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517934780570,"sku":"BCC70610","price":249.16,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1-FgEGAhfOa8k7Wbio0na8frV-F0mG_099dec15-2aec-4b29-a013-c63cc1820c02.jpg?v=1772671967"},{"product_id":"double-concave-lens-caf2-uncoated-200-nm-8-0-μm-bcc70607","title":"Double-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted BCC70607","description":"\u003ch2\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted — Model BCC70607\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 200 nm-8.0 μm, focal length -30.0 mm, Ø25.4 mm, substrate CaF2.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: CaF2\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8.0 μm\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA double-concave lens has concave surfaces on both sides with identical radii of curvature. It has a negative focal length and is commonly used for beam collimation, increasing (or decreasing) focal length, or expanding (or reducing) image size. CaF₂ is the most common material for infrared lenses, and LBTEK chooses to use CaF₂ to manufacture various lenses, primarily for infrared applications. In addition to CaF₂ double-concave lenses, LBTEK also offers double-concave lenses made of N-BK7 and N-SF11. LBTEK provides uncoated double-concave lenses with a theoretical operating wavelength range of 200 nm to 8.0 μm. All our lenses undergo fine processing and strict quality control to ensure that LBTEK delivers high-quality lens products to users at reasonable prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, CaF2, uncoated: 200 nm-8.0 μm, unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 200 nm-8 μm (uncoated)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, beam expansion or reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. LBTEK chooses to use CaF2 to manufacture various lenses. CaF2 exhibits high transmittance in both ultraviolet and infrared spectral ranges, along with an extremely high damage threshold, making it widely applicable in the excimer laser industry. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model, type, diameter, and focal length for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517934878874,"sku":"BCC70607","price":249.16,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1-FgEGAhfOa8k7Wbio0na8frV-F0mG_5dd0ad09-c55f-4829-a0db-69f60efd45b7.jpg?v=1772671972"},{"product_id":"double-concave-lens-n-sf11-ar-coating-700-nm-1100-nm-mbcc30605-b","title":"Double-concave lens, N-SF11, AR coating: 700 nm-1100 nm MBCC30605-B","description":"\u003ch2\u003eDouble-concave lens, N-SF11, AR coating: 700 nm-1100 nm — Model MBCC30605-B\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 700 nm-1100 nm, focal length -25.0 mm, Ø25.4 mm, substrate N-SF11.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-concave lens, N-SF11, AR coating: 700 nm-1100 nm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. The surfaces of these mechanical components.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517934977178,"sku":"MBCC30605-B","price":74.38,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-SF11_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A700_20nm-1100_20nm-Fux7R9FwEGolWV5u9UvTOzmAdujX.jpg?v=1772671977"},{"product_id":"double-concave-lens-n-sf11-ar-coating-700-nm-1100-nm-bcc30605-b","title":"Double-Concave Lens, N-SF11, AR Coating: 700 nm-1100 nm, Unmounted BCC30605-B","description":"\u003ch2\u003eDouble-Concave Lens, N-SF11, AR Coating: 700 nm-1100 nm, Unmounted — Model BCC30605-B\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 700 nm-1100 nm, focal length -25.0 mm, Ø25.4 mm, substrate N-SF11.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-SF11, AR Coating: 700 nm-1100 nm, Unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-SF11\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion or Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can select the optimal mounting method based on different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517935042714,"sku":"BCC30605-B","price":60.25,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-SF11_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A700_20nm-1100_20nm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FnsggQkbyEwAfc8hi3D8O07j4hRl.jpg?v=1772671982"},{"product_id":"double-concave-lens-n-bk7-ar-coating-700-nm-1100-nm-mbcc10610-b","title":"Double-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm MBCC10610-B","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm — Model MBCC10610-B\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 700 nm-1100 nm, focal length -50.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses feature concave surfaces on both sides with equal radii of curvature. With a negative focal length, these lenses are commonly used for beam collimation, focal length adjustment, and image reduction or magnification.\n\nLBTEK offers double-concave lenses fabricated from N-BK7, the most widely used optical glass for visible and near-infrared applications. In addition, N-SF11 double-concave lenses are available; with a lower Abbe number, N-SF11 enables shorter focal lengths compared to N-BK7.\n\nA variety of coating options are provided, including uncoated, 400–700 nm, 700–1100 nm, and 1100–1650 nm broadband AR coatings, to support diverse application needs. Each lens is precisely manufactured and quality-controlled to ensure that LBTEK delivers high-performance optics at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003cli\u003ePre-installed Mechanical Housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in the visible and near-infrared spectral ranges. All LBTEK circular lenses come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model numbers, types, diameters, and focal lengths for easy identification of lens parameters by users.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517935108250,"sku":"MBCC10610-B","price":66.76,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/1-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A700_20nm-1100_20nm-FljioNGadnoditPJ8IT5xMsqh_u3.jpg?v=1772671987"},{"product_id":"double-concave-lens-n-bk7-ar-coating-700-nm-1100-nm-bcc10610-b","title":"Double-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm, Unmounted BCC10610-B","description":"\u003ch2\u003eDouble-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm, Unmounted — Model BCC10610-B\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eOperating wavelength 700 nm-1100 nm, focal length -50.0 mm, Ø25.4 mm, substrate N-BK7.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLBTEK double-concave lenses feature concave surfaces on both sides with equal radii of curvature. With a negative focal length, these lenses are commonly used for beam collimation, focal length adjustment, and image reduction or magnification.\n\nLBTEK offers double-concave lenses fabricated from N-BK7, the most widely used optical glass for visible and near-infrared applications. In addition, N-SF11 double-concave lenses are available; with a lower Abbe number, N-SF11 enables shorter focal lengths compared to N-BK7.\n\nA variety of coating options are provided, including uncoated, 400–700 nm, 700–1100 nm, and 1100–1650 nm broadband AR coatings, to support diverse application needs. Each lens is precisely manufactured and quality-controlled to ensure that LBTEK delivers high-performance optics at competitive prices.\u003c\/p\u003e\n\u003ch3\u003eDouble-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm, Unmounted\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSubstrate Material: N-BK7\u003c\/li\u003e\n\u003cli\u003eOperating Wavelength: 700 nm-1100 nm (AR Coating)\u003c\/li\u003e\n\u003cli\u003eApplication: Imaging, Beam Expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBTEK bi-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. LBTEK bi-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in visible and near-infrared fields. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can choose the optimal mounting method for different application scenarios.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":47517935141018,"sku":"BCC10610-B","price":49.65,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/2-1_E5_8F_8C_E5_87_B9_E9_80_8F_E9_95_9C_EF_BC_8CN-BK7_EF_BC_8C_E5_A2_9E_E9_80_8F_E8_86_9C_EF_BC_9A700_20nm-1100_20nm_EF_BC_8C_E6_9C_AA_E5_AE_89_E8_A3_85-FrVO6LJRBZczJ8JilQUCy_PAAcGr.jpg?v=1772671992"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/collections\/2-1-FgEGAhfOa8k7Wbio0na8frV-F0mG_9b4c3c7b-7227-4c38-9c62-468287719f97.jpg?v=1777788766","url":"https:\/\/waveqvanta.com\/collections\/lbtek-optics-bi-concave-lenses.oembed","provider":"WaveQuanta","version":"1.0","type":"link"}