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OPTIMIZING FAST SOLID-STATE PHOTOCONDUCTIVE CELLS FOR PCM APPLICATIONS.
ARMY ELECTRONICS LABS FORT MONMOUTH N J
This report discusses the characteristics of photoconductive devices in general terms relative to their basic semiconductor parameters, particularly for the detection of very short light signals. Included are two cases to be distinguished, i.e., where the pulse length is longer or where it is shorter than the carrier lifetime. In the first case, the rise time, decay time, and maximum signal sensitivity are almost completely determined by the lifetime alone, while in the second case the rise time and signal sensitivity are independent of the lifetime and only dependent on the length and integral over the intensity of the light pulse. Methods for optimizing cell parameters for both modes of operation are examined, and the use of photoconductive cells for the detection of pulse-code modulated signals is discussed. Author