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MidOpt Bi Series Filter Bi525

Uniforce Product

Salient Features

Bi Series Narrow Interference Bandwidth

  • 20-35nm FWHM; Narrow bandwidth
  • High transmission ≥85%
  • Designed for use with laser diodes
  • Ideal wavelength separation when multiple light sources of similar wavelengths are present
  • Reflective, mirror-type surface that helps minimize thermal effects
  • Available in sizes up to 79.5mm sq.

APPLICATIONS: Bi Series are popular for life science and laser analysis applications where only discrete wavelengths need to be passed to maximize system performance.


Bi525 features a narrow passband combined with high peak transmission and excellent out-of-band blocking. It succeeds and improves upon both Bi518 and Bi520 bandpass filters, particularly when it comes to blocking in the near-infrared spectrum. Bi525 filters are typically used in applications employing 520nm green laser diodes or 520nm/525nm green LED light sources. The latter typically finds use in machine vision inspection while the former is commonly used in bioanalytical applications. Various popularly used fluorophores (e.g., GFP, GelStar, SYBER Green, etc.) have emission maximas at or very near 525nm, and Bi525 filters can be used to effectively block excitation sources as well as other interfering longer and shorter wavelength light while letting desired green emission wavelengths pass.

    • Useful Range : 518-538nm
    • FWHM : 28nm
    • Tolerance : +/- 5nm
    • Peak Transmission : ≥90%
    • Surface Quality : 40/20
    • Compatible LED : 520, 525, 530nm
    • Thickness : 0.5, 1, 2mm






MidOpt StablEDGE™ optical filters are specifically designed to be less  susceptible to effects from angular shifting seen when optical filters are placed in front of short focal length (<12 mm) camera lenses.
StablEDGE™ filters take advantage of absorptive filter glass to form the leading
edge of the filter passband.This assures no shifting in this region, even when the
lens FOV exceeds 100°.StablEDGE™ designs are  less angle-of-incidence sensitive, inherently more rugged, and are environmentally stable.

BI525 Trans Graph


Bi525 Transmission Chart


Learn More About

›  Color Separation for Monochrome Imaging

›  Blocking Unwanted Light in Monochrome Imaging

›  How Bandpass Filters Increase Resolution in Monochrome Imaging

›  Near-IR Imaging in Monochrome Applications

›  Fluorescense Imaging in Monochrome Applications

> Learn More About How to Minimize the Effects of Short Shifting

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