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    • 875nm Long-Pass Dichroic Filter

    The MP-DF-875 is a long-pass dichroic filter specifically designed for a 45° incidence optical path. Manufactured with a high-performance multilayer dielectric coating process, it efficiently reflects light in the 350-857.5 nm band while transmitting light in the 892.5-1600 nm band with an average near-infrared transmittance greater than 93 %. The product features a steep cut-off edge, laser-grade optical quality, low wavefront error, and excellent optical power resistance. It effectively separates visible and near-infrared light and is widely used in fluorescence microscopy, biomedical imaging, laser beam paths, spectroscopy, machine vision, and other precision optical systems.

    Product features：875 nm long‑pass design；45° standard operating angle；Near‑infrared transmittance exceeding 93 %；High reflectance in the visible region；Low wavefront error；High optical power resistance

    Part Number：MP-DF-875

    Application area：Fluorescence microscopy | Bioimaging | Laser systems | Spectrometers | Industrial machine vision

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    Main parameters
  • Core parameters

  • Edge Wavelength Transmission Band Reflection Band

    875 nm 892.5–1600 nm，Tavg >90% 350–857.5 nm

  • Dimension Drawing
    • General Parameters

    Specification

    Value

    Transmission Band

    Tavg > 93%  892.5–1600 nm

    Transmission Band, p-pol

    Tavg > 90%  892.5–1600

    Transmission Band, s-pol

    Tavg > 90%  892.5–1600

    Reflection Band

    350 – 857.5 nm

    Edge Steepness

    Standard (for Fluorescence)

    Edge Wavelength

    875nm

    Angle of Incidence

    45 ± 1.5 °

    Cone Half-angle

    2°

    Flatness / RWE Classification

    Laser

    Reflected Wavefront Error

    < 6λ P-V RWE @ 632.8

    Clear Aperture

    ≥ 80% (elliptical)

    Transverse Dimensions, LxW

    25.2 mm x 35.6 mm

    Filter Thickness, Unmounted

    1.05mm

    Filter Thickness Tolerance, Unmounted

    ± 0.05mm

    Surface Quality (Scratch-Dig)

    60-40

    Filter Effective Index

    1.52

    Optical Damage Rating

    Testing has proven to show no signs of degradation when exposed to at least 6.0 W of power from an unfiltered xenon arc lamp over a 25 mm diameter (corresponding to 1.2 W/cm2) for over 500 hrs.

    Orientation

    Reflective surface marked with part-Orient in incoming light

     

    Spectral Characteristic Curves

     

    Transmittance-Wavelength Spectrum

    图片1.png 

     

     

    Optical Density Spectrum

     图片2.png


    Optional Configurations

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  • Product title: 875nm Long-Pass Dichroic Filter
  • Product link: https://www.idealphotonics.com/product/detail/1725.html

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      • Other Requirements:

    • 10+ 10 Years of Experience
    • 50 50 + Countries Bussiness
    • 10000 10k + Diodes sold worldwide
    • 30 30+ Invention patent
    • 10 10+ Advanced Optical Solutions

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