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High-sensitivity two-photon absorption microcavity autocorrelator

Institute of Electrical and Electronics Engineers
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  • Optoelectronics
  • Optical Communication
  • Cavities
  • Correlation
  • Nonlinear Detection
  • Optical Pulse Measurements
  • Photodetectors
  • Photodiodes
  • Physics


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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