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Photoreceiver Characteristics

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Photoreceiver Characteristics

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Photoreceivers are based on the same types of semiconductor photodiodes used for power sensors (see Photodiode Sensor Physics) and camera-based beam profiling (see Laser Beam Profile Measurement). Since these applications are mainly focused on steady-state (quasi-CW) optical response or, for a pulsed source, the time-integrated response, the actual temporal response of the optical signal is not critical. However, many applications require the monitoring of rapid events and therefore, high-speed optical detection is necessary. The characteristics of such high-speed photoreceivers as well as their associated applications are the subjects of this section. Photoreceivers focused on sensitive detection of optical signals at low-light levels or those that exhibit small differential changes are also addressed.

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