APD (Avalanche Photodiode) refers to a type of highly sensitive photodetector used in various aerospace applications, including space-based LIDAR systems and optical communication. APDs are semiconductor devices that convert light energy into an electric current, and are known for their ability to detect very low light levels, even down to a single photon. These detectors are utilized in laser range finders, atmospheric condition measurements, and mapping the cosmos. NASA and companies like Excelitas and Mynaric Lasercom are among those developing and utilizing APD technology for space-related applications.
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