{"product_id":"ng9-absorptive-nd-filter-25-4mm-od3-0","title":"NG9 Absorptive ND Filter, Ø25.4 mm, OD 3.0","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis mounted absorptive neutral density filter carries a broadband AR coating (350–700 nm) on both surfaces, minimizing surface reflection (average R \u0026lt; 0.5% at normal incidence) to reduce stray light. It is mounted in an SM1-threaded Ø1\" lens tube compatible with cage systems and lens tubes; the cell can be removed by loosening the retaining ring. Unlike metallic ND filters, absorptive ND filters are made from Schott-family glasses with a spectrally flat absorption coefficient, delivering uniform attenuation across the visible band.\u003c\/p\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBroadband beam attenuation\u003c\/li\u003e\n  \u003cli\u003eLaser power \/ intensity control\u003c\/li\u003e\n  \u003cli\u003eImaging \u0026amp; detector protection\u003c\/li\u003e\n  \u003cli\u003eOptical measurement \u0026amp; illumination control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eConstruction \u0026amp; Performance\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e NG9 (Schott absorptive glass)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e AR Coating (BBAR, 350–700 nm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Ø25.4 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 2.1 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpectral range:\u003c\/strong\u003e 350–700 nm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOD:\u003c\/strong\u003e 3.0\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating spec:\u003c\/strong\u003e BBAR@350-700 nm, Ravg\u0026lt;0.5%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClear aperture:\u003c\/strong\u003e \u0026gt;20 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e SM1-threaded Ø1\" lens tube (SM1L03)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall thickness (housed):\u003c\/strong\u003e 11.4 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface quality:\u003c\/strong\u003e 60-40 Scratch-Dig\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface flatness:\u003c\/strong\u003e λ\/4 @ 633 nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eStorage \u0026amp; Handling\u003c\/h2\u003e\n\u003cp\u003eFor optimal performance, store and use at 25 °C and 40–60% relative humidity. If the surface becomes contaminated, clean gently with ≥99% alcohol and lint-free lens tissue; never use coarse cloth, water, or abrasive cleaners, which may damage the optic.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":48194695495834,"sku":"O-NDF-25.4-2.1-BL515","price":0.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/664694-nd-main.png?v=1780478338","url":"https:\/\/waveqvanta.com\/products\/ng9-absorptive-nd-filter-25-4mm-od3-0","provider":"WaveQuanta","version":"1.0","type":"link"}