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632.8 nm Ultrasteep Raman Long-Pass Filter
The MP-LPF-633 is an ultra-steep-edge long-pass filter specifically designed for 632.8 nm laser systems. It provides deep blocking of the 632.8 nm laser line and short-wavelength background light, while allowing efficient transmission of Raman and fluorescence signals above the cut-off edge. The product offers an optical density greater than OD6 at 632.8 nm and an average transmittance greater than 93% over the 641-1427.4 nm band. With a transition width of only 6.3 nm, it is ideally suited for Raman spectroscopy systems that demand high laser rejection, steep cut-off edges, and efficient near-laser-line signal collection.
Product features:Specifically designed for 632.8 nm Raman laser systems;High transmission: average transmittance > 93%;Laser blocking depth: OD6;Ultra‑steep cut‑off edge, suitable for high‑resolution Raman spectroscopy;Narrow transition band design, effectively improving weak Raman signal collection efficiency;Fused silica substrate with excellent thermal and environmental stability
Part Number:MP-LPF-633
Application area:Raman spectrometers | Laser Raman Imaging Systems | Biomedical Detection | Laser Spectroscopy Analysis | Scientific Research Equipment
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Laser Wavelength Transmission Band
632.8 nm Tavg > 93 % 641–1427.4 nm

Specification | Value |
Laser Wavelength | 632.8 nm |
Transmission Band | Tavg > 93 % 641–1427.4 nm |
Blocking Band | OD > 6 632.8 nm |
Blocking Band | ODavg > 6 513–632.8 nm (typical) |
Edge Steepness | 0.5% |
Edge Steepness | 78.6 cm-1 |
Edge Steepness | Ultrasteep (for Raman) |
Edge Steepness | 3.2 |
Edge Wavelength | 637.7 nm |
Transition Width | 6.3 nm |
Transition Width | 156 cm-1 |
Angle of Incidence | 0 ± 2° |
Cone Half-angle | 5° |
Clear Aperture | 22 mm |
Transverse Dimensions, Diameter | 25 mm |
Filter Thickness, Mounted | 3.5 mm |
Filter Thickness Tolerance, Mounted | ± 0.1 mm |
Filter Thickness, Unmounted | 2.0 mm |
Filter Thickness Tolerance, Unmounted | ± 0.1 mm |
Surface Quality (Scratch-Dig) | 60-40 |
Filter Effective Index | 1.8 |
Optical Damage Rating | 0.5 J/cm2 @ 266 nm (10 ns pulse width),1 J/ @ 53 cm2 2 nm (10 ns pulse width) |
Orientation | Arrow on ring is preferred direction of propagation of light |
Substrate Type | Fused Silica |
Spectral Characteristic Curves
Transmittance-Wavelength Spectrum
Optical Density Spectrum

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