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    • 420 nm Narrow Bandpass Optical Filter

    The MP-NBP-420 is a high-performance optical filter element designed for the 420 nm band. Manufactured using precision thin-film coating technology, it achieves high transmission in the spectral region of 417.5-422.5 nm, while effectively suppressing ultraviolet, adjacent blue-light regions, and a broad range of visible and near-infrared wavelengths. The filter features high passband transmittance (Tavg > 90%), narrow bandwidth (FWHM 8.2 nm), and deep blocking capability (ODavg up to 5), which significantly improves system signal-to-noise ratio and reduces background and stray light interference. The product adopts a Ø25 mm circular design, offering good mechanical compatibility and optical stability. It is suitable for high-precision spectral detection, fluorescence analysis, optical imaging, and scientific research applications.

    Product features：High‑transmission narrowband selectivity；Excellent out‑of‑band blocking capability；Narrow FWHM design；High optical stability；Low angular sensitivity design

    Part Number：MP‑NBP‑420

    Application area：Fluorescence detection and bio‑analysis systems | Spectral analysis instruments | UV/Visible light detection systems | Environmental monitoring and sensing devices

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    Main parameters
  • Core parameters

  • Laser Wavelength Transmission Band

    420 nm Tavg > 90% 417.5 – 422.5 nm

  • Dimension Drawing
    • General Parameters

    Specification

    Value

    Transmission Band

    Tavg > 90%  417.5 – 422.5 nm

    Blocking Band

    ODavg > 5  300 – 404 nm

    Blocking Band

    ODavg > 2  404 – 412 nm

    Blocking Band

    ODavg > 2  428 – 436 nm

    Blocking Band

    ODavg > 5  436 – 1200 nm

    FWHM Bandwidth

    8.2nm

    Guaranteed Minimum Bandwidth

    5

    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

    3.5 mm

    Filter Thickness Tolerance, Unmounted

    ±0.1mm

    Surface Quality (Scratch-Dig)

    60-40

    Filter Effective Index

    2.38

    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: 420 nm Narrow Bandpass Optical Filter
  • Product link: https://www.idealphotonics.com/product/detail/1700.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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