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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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    Main parameters
  • Core parameters
  • Laser Wavelength Transmission Band

    632.8 nm Tavg > 93 % 641–1427.4 nm

  • Dimension Drawing
  • General Parameters

    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

    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

    图片2.png 

     

     

    Optical Density Spectrum

     图片3.png


    Optional Configurations

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    Downloads

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  • Product title: 632.8 nm Ultrasteep Raman Long-Pass Filter
  • Product link: https://www.idealphotonics.com/product/detail/1660.html
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