High sensitivity two photon absorption microcavity autocorrelator
DONEGAN, JOHN FRANCIS
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Citation:Krug, T., Lynch, M., Bradley, A.L., Donegan, J.F., Barry, L.P., Folliot, H., Roberts, J. S., Hill, G. 'High sensitivity two photon absorption microcavity autocorrelator' in Photonics Technology Letters, 16, 2004, pp. 1543 ? 1545.
A GaAs?AlAs microcavity device has been used as a photodetector in an autocorrelator for measuring the temporal pulsewidth of 1.5- 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 10 4 (mW)2, which represents two orders of magnitude improvement when compared with conventional autocorrelators