903nm laser rangefinder narrowband filter (narrow band-pass filter) is a relatively narrow bandwidth, shortwave and longwave significantly off, allowing light to pass through a specific wavelength of light reflection and let the other band (or attenuation) of optical elements. Bandpass filter work area may be ultraviolet band, visible light, near-infrared light, far infrared light, depending on your range of application. Half-bandwidth (FWHM) of less than 25nm, the center wavelength plus or minus 1.0nm, peak by more than 85%. Suitable for measuring instrument, laser range finder, a variety of test systems, night vision and other products on the thickness of less than 1.2mm.. Advantages: low price, good wavelength stability, relatively high cutoff rate OD4, only half the bandwidth of small 25nm, optical indicators: Peak through: T> 85% half-bandwidth: 25nm center wavelength: 903 ± 1nm appearance requirements: 60/40 Application areas: Night Vision phones, laser night vision, laser measuring instrument, 905 infrared security cameras, optical instruments, biological, fingerprint, face, facial, iris recognition system.