Raman long-pass filter RET638LP

Raman long-pass filter — Model RET638LP

ØØ25.0 mm.

Product Description

• Outer diameter 25.0 mm, with mechanical retaining ring
• High environmental resistance, long service life
• FWHM: 3 nm, 4 nm, 5 nm, 6 nm, 7 nm
• Center wavelength: 266 nm-1064 nm
• Optical density in stop band: OD5, OD6

LBTEK offers CHROMA Raman Filters with a diameter of 25 mm and mechanical retaining rings. Raman Filters are bandpass filters with a bandwidth of less than 10 nm, used in instruments such as Raman spectrometers. Raman filters fully transmit only the central wavelength, with optical densities in the stop band reaching as high as OD5 and OD6. LBTEK's CHROMA Raman filters utilize a magnetron sputtering coating process, resulting in high transmittance, a high cutoff depth, and a high steepness. In Raman spectroscopy applications, they effectively reduce stray light interference, improve spectral signal quality, and enhance detection sensitivity and accuracy.

Raman long-pass filter

• Longpass Filter
• Cut-On Wavelength: 270 nm-1072 nm
• Outer Diameter 25.0 mm, with Mechanical Retaining Ring
• Angle of Incidence: 0°

LBTEK Raman long-pass filters include two types: low wavenumber Raman long-pass filters and conventional Raman long-pass filters. They are optical filters that allow light with wavelengths longer than a specific wavelength to pass through. They exhibit high transmittance (Tavg > 90%) for light longer than the starting (cut-off) wavelength and high blocking depth (ODavg > 6) for light shorter than the starting (cut-off) wavelength. The filters are pre-installed in Ø25.0 mm black anodized aluminum rings, with the light propagation direction marked by an arrow on the housing for easy installation and use. Raman long-pass filters are recommended for use at an incident angle of 0°. When used at incident angles deviating from the design angle, the starting (cut-off) wavelength may shift.