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    • 785 nm Raman Edge Longpass Filter

    MP-LPF-785 is a high-performance edge longpass filter specifically designed for 785 nm laser-based Raman spectroscopy systems. The product employs advanced multi-layer dielectric hard-coating technology, which effectively blocks the 785 nm laser excitation light while transmitting Raman Stokes scattering signals with high transmittance. With its steep cut-off edge and excellent blocking depth, the filter enables detection of Raman signals at low wavenumbers down to approximately 309 cm-1, making it suitable for research-grade Raman spectrometers, portable Raman analyzers, and various OEM spectroscopic systems.

    Product features：Specifically optimized for 785 nm Raman laser excitation；Steep Raman cut‑off edge, suitable for low‑wavenumber Raman detection；Laser blocking depth: OD6； Average transmittance > 93%；High‑stability dielectric hard coatings； High signal‑to‑noise ratio for improved detection sensitivity

    Part Number：MP-LPF-785

    Application area：Raman spectrometers | Portable Raman analyzers | Biomedical Detection | Chemical substance detection | Scientific research and laboratory equipment

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    Main parameters
  • Core parameters

  • Laser Wavelength Transmission Band

    785 nm Tavg > 93 % 812.1–1200 nm

  • Dimension Drawing
    • General Parameters

    Specification

    Value

    Laser Wavelength

    785 nm

    Transmission Band

    Tavg > 93 %  812.1–1200 nm

    Blocking Band

    OD abs> 5  270-624 nm

    Blocking Band

    ODavg > 6  545–671 nm

    Edge Steepness

    Ultrasteep (for Raman)

    Edge Wavelength

    805 nm

    Transition Width

    19.8 nm

    Transition Width

    309 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

    1.74

    Optical Damage Rating

    Not tested

    Orientation

    Arrow on ring is preferred direction of propagation of light

     

    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: 785 nm Raman Edge Longpass Filter
  • Product link: https://www.idealphotonics.com/product/detail/1679.html

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    • 10000 10k + Diodes sold worldwide
    • 30 30+ Invention patent
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