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Responsivity
Responsivity: In a photodetector[?], the ratio of the electrical output to the optical input.
Note 1: Responsivity is usually expressed in amperes per watt, or volts per watt, of incident radiant power[?].
Note 2: Responsivity is a function of the wavelength of the incident radiation and the bandgap of the material of which the photodetector is made. Deprecated synonym sensitivity.
Source: from Federal Standard 1037C and from MIL-STD-188
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