A device that detects or responds to incident light by using the electrical effect of individual photons.
- A plurality of photodetectors is used to detect the light and determine a first three-dimensional position of the interaction.
- As the optical input signal (blue line) to a photodetector increases, the electrical output signal (red line) increases proportionally, and then begins to deviate from linear.
- In the simple experiment, a converging lens focuses laser light from two pinholes onto two different photodetectors.
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