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Bandpass
Anti-reflection Bandpass Contest Couple Half-Half Longpass One peak PBS Shortpass

 

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A band-pass filter (also spelled bandpass) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. Bandpass filters only transmit a certain wavelength band, and block others. The width of such a filter is expressed in the wavelength range it lets through and can be anything from much less than an Ångström to a few hundred nanometers. Such a filter can be made by combining an LP- and an SP filter.

Bandpass filters are passive optical devices that control the flow of light. They can be used either to isolate certain wavelengths or colors, or to control the wavelengths reaching a detector. Applications range from detecting the gaseous composition of a distant star to determining the chemical activity in a human cell.

i.e.    G|HLHLLHLH|G   nG=1.52, nH=2.35, nL=1.35, λ=662nm


 

 

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