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    • 685 nm Bandpass Filter

    The 685 nm bandpass filter is a high‑performance narrow‑band interference filter centered at 685 nm, manufactured with precision multi‑layer dielectric hard‑coating technology. It provides high transmittance in the target band while delivering excellent blocking performance in the ultraviolet, visible, and near‑infrared regions. With high signal‑to‑noise ratio, low background interference, and good environmental stability, the filter is suitable for high‑precision optical systems in life sciences, fluorescence detection, microscopy imaging, laser metrology, and scientific research.

    Product features：Center wavelength approximately 685 nm；Average passband transmittance > 93%；Full width at half maximum (FWHM) 16.3 nm；Multi‑zone high‑blocking design with maximum OD up to 6；High-stability dielectric hard coating；Long lifetime and excellent environmental stability

    Part Number：MP-BPF-685

    Application area：Fluorescence microscopy | Biomedical detection | Laser optical systems | Research and industrial inspection

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    Main parameters
  • Core parameters

  • Laser Wavelength Transmission Band

    685 nm Tavg > 93% 680 – 690 nm

  • Dimension Drawing
    • General Parameters

    Specification

    Value

    Transmission Band

    Tavg > 93%  680 – 690 nm

    Blocking Band

    ODavg >5  200 ­ 275 nm

    Blocking Band

    ODavg > 5  275 ­ 400 nm

    Blocking Band

    ODavg > 6  400 – 669 nm

    Blocking Band

    OD > 3.5  698.5 nm

    Blocking Band

    ODavg > 6  701 – 850 nm

    Blocking Band

    ODavg > 4  850–925 nm

    Blocking Band

    ODavg > 2  925–1100 nm

    FWHM Bandwidth

    16.3nm

    Guaranteed Minimum Bandwidth

    10

    Angle of Incidence

    0 ± 5°

    Cone Half-angle

    7°

    Clear Aperture

    ≥21mm

    Transverse Dimensions, Diameter

    25 mm

    Filter Thickness, Mounted

    5.0 mm

    Filter Thickness Tolerance, Mounted

    ±0.1mm

    Filter Thickness, Unmounted

    2.0 mm

    Filter Thickness Tolerance, Unmounted

    ±0.1mm

    Surface Quality (Scratch-Dig)

    60-40

    Filter Effective Index

    1.94

    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

    Arrow on ring is preferred direction of propagation of light

     

    Spectral Characteristic Curves

     

    Transmittance-Wavelength Spectrum

     图片1.png 

     

    Optical Density Spectrum

    图片2.png 


    Optional Configurations

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    Downloads

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  • Product title: 685 nm Bandpass Filter
  • Product link: https://www.idealphotonics.com/product/detail/1674.html

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    • 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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