Heinrich Hertz (1857–1894) discovered the photoelectric effect in 1887; its origin was explained by Einstein in 1905.
Siménis Denis (1781–1840) developed the fundamental probability distribution that describes photodetector noise.
A photodetector is a device whose electrical characteristics (e.g., current, voltage, resistance) vary when exposed to light. By converting the energy of the absorbed photons into a measurable form, it can be used to determine the photon flux (or optical power) of a light beam. It can also be used to display temporal and/or spatial interference between ...
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