Bandpass Filters for Range Finder

Bandpass filters are used in rangefinders mainly on the receiver side to help the detector see the returned laser signal more clearly.
Diagram showing a laser rangefinder receiver using a bandpass filter to pass the reflected laser signal while reducing unwanted sunlight and ambient background before the detector.
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Filters

11 items
Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)

Filter

Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)
Before-and-after diagram showing how a bandpass filter reduces sunlight and ambient background so a rangefinder detector receives a clearer return signal.

Reduces sunlight and background light

Outdoor rangefinders receive a lot of unwanted light:

  • sunlight
  • sky background
  • reflections from surroundings
  • LED / lamp background
  • thermal or broadband background

A bandpass filter blocks much of this out-of-band light before it reaches the detector.

This helps improve:

  • signal-to-background ratio
  • detection stability
  • measurement reliability
  • maximum useful range

Match the Filter to the Rangefinder Laser Wavelength

Select the bandpass filter center wavelength to match the rangefinder laser source.

850nm → BP850
905nm → BP905
940nm → BP940
1064nm → BP1064
1550nm → BP1550

Diagram showing rangefinder laser wavelengths matched to corresponding bandpass filters, including 850nm, 905nm, 940nm, 1064nm, and 1550nm options.
Infographic showing how a 3–10nm narrow bandpass filter with OD4+ blocking passes the laser return wavelength while reducing out-of-band background for a cleaner receiver signal.

Narrow Bandwidth and High Blocking for Receiver Filtering

  • 3–10nm bandwidth helps isolate the return signal
  • OD4+ blocking reduces unwanted background light
  • Cleaner receiver signal improves detection stability