A GaAs-AlAs microcavity device has been used as a photodetector in an autocorrelator for measuring the temporal pulsewidth of 1.5-μm optical pulses. Enhancement of the two-photon absorption photocurrent due to the microcavity structure results in an autocorrelation (average power times peak power) sensitivity of 9.3×10/sup -4/ (mW)2, which represents two orders of magnitude improvement when compared with conventional autocorrelators.
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Krug et al. (2004) studied this question.
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