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Specifying Bandpass Filters

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Specifying Bandpass Filters

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The first step toward developing a successful design of any optical interference filter having is an understanding of the operating environment of the filter. Parameters such as angle-of-incidence, operating temperature, illumination source, and detector have a significant effect upon filter performance. Two wavelengths in the bandpass where the transmittance is equal to 50% of peak transmittance (50%Tpk). In some cases, a bandpass can have more than two wavelengths where the transmittance is equal to 50%Tpk. In these cases, the shortest wavelength of 50%Tpk encountered on the transition slope (from rejection to transmittance), and the longest wavelength of 50%Tpk encountered on the transition slope (from transmittance to rejection), would be chosen as the half-power wavelengths.

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