High-sensitivity two-photon absorption microcavity autocorrelator
Krug, T. and Lynch, Michael and Bradley, Ann Louise and Donegan, John Francis and Barry, Liam P. and Folliot, H. and Roberts, J.S. and Hill, G. (2004) High-sensitivity two-photon absorption microcavity autocorrelator. IEEE Photonics Technology Letters, 16 (6). pp. 1543-1545. ISSN 1041-1135
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A GaAs-AlAs microcavity device has been used as a photodetector in an autocorrelator for measuring the temporal pulsewidth of 1.5-/spl mu/m 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/spl times/10/sup -4/ (mW)/sup 2/, which represents two orders of magnitude improvement when compared with conventional autocorrelators.
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