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The temporal response of a GaAs metal-semiconductor-metal (MSM) photodetector with a finger spacing of 0.1 mu m is discussed. The intrinsic detector has a minor effect (25% increase) on the full width at half-maximum (FWHM) of the temporal response of the device and its parasitic circuit elements. The analysis indicates that a long time constant due to the decay of holes is solely responsible for this increase. The smallest FWHM for this detector is estimated to be less than 2.5 ps.>
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Koscielniak et al. (1989) studied this question.
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