Narrow Bandpass Filter 

Filter 

Custom wavelengths available (nm) 

In-stock center wavelengths: 405nm, 532nm, 650nm, 808nm, 850nm, 940nm, 1064nm and more.
A specific center wavelength and bandwidth (FWHM) can be customized according to your requirements.

 Available Services 

  • Custom Design & Manufacturing 

    We design and produce narrow bandpass filters to your exact specifications — center wavelength, bandwidth (FWHM), size and substrate material fully customizable. Round, square or custom shapes available. Ideal for laser systems, fluorescence detection, machine vision, LiDAR and spectroscopy.

  • Accurate Wavelength Selection 

    Only the target wavelength passes through while all out-of-band light is deeply blocked. High peak transmittance (up to 90%+) with out-of-band blocking (OD 4–6 or higher), delivering a clean, high signal-to-noise output for precise detection.

  • Enhanced Coating Options 

    Optional AR anti-reflection coating for even higher transmittance; waterproof and oil-proof protective coating for easy cleaning and long-term durability; custom coating combinations available upon request.

Key Differentiators 

A Narrow Bandpass Filter is a high-precision optical component that transmits only the target wavelength while deeply blocking all out-of-band light. It is not an ordinary color glass, but a multi-layer interference-coated device — with bandwidths as narrow as a few nanometers and out-of-band blocking of OD 4–6 or higher, making it one of the most reliable wavelength-selection components in modern precision optical systems.

Why Choose Our Narrow Bandpass Filters 

  • Accurate Wavelength Selection 

    A narrow bandpass filter passes only the target wavelength — bandwidth as narrow as a few nanometers — while deeply blocking all out-of-band light. Enables precise, interference-free detection in demanding optical systems.

  • High Transmittance, Deep Blocking 

    Peak transmittance of up to 90%+ at the center wavelength, with out-of-band blocking of OD 4–6 or higher. Stray light and background interference are effectively suppressed, delivering a clean, high signal-to-noise output.

  • Broad Wavelength Coverage & Stability 

    Available across a wide range of center wavelengths from UV to NIR (e.g. 405nm, 532nm, 650nm, 808nm, 850nm, 940nm, 1064nm). Excellent stability against temperature, humidity and aging — ideal for fluorescence detection, Raman spectroscopy, LiDAR, machine vision and optical communication.

Applications 

Narrow bandpass filters serve as essential wavelength-selection components in precision optical systems, including fluorescence detection (qPCR, flow cytometry, ELISA), Raman spectroscopy, laser systems, machine vision and LiDAR — delivering clean, interference-free signals.


Their real-world applications also cover medical diagnostics, astronomy and remote sensing, optical communication (WDM), environmental and gas sensing, biometric recognition (e.g. IR face recognition), industrial inspection, colorimetry and photometry — wherever precise wavelength selection is required.