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Acta Optica Sinica

Ps two-wave coupling in InP and its application

Hua Mao, Xinping Deng

Published Jan 1, 1990• 0 citations
OpenAlex

Abstract

Experimental investigations on ps two-wave coupling in InP:Fe are reported in this paper. Transient two-wave coupling gain versus delay time between pump beam and probe beam has been measured. The properties of carious processes in transient two-wave coupling are analyzed. An ps optical switching with high signal-noise ratio and transmissivity of 17 % under low pump intensity has been realized.

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Photorefractive two-wave mixing bistability in Fe: KNbO3 without external feedback: Increasing gain bistability

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Applied Physics Letters•Sep 2, 1996•6 citations
Experimental investigations on ps two-wave coupling in InP:Fe are reported in this paper. Transient two-wave coupling gain versus delay time between pump beam and probe beam has been measured. The properties of carious processes in transient two-wave coupling are analyzed. An ps optical switching with high signal-noise ratio and transmissivity of 17 % under low pump intensity has been realized.
We show that even if there is no direct hole–electron competition in InP:Fe the gain is lower than expected. We attribute this reduction of the gain to a thermally induced hole–electron competition that involves the excited state of Fe2+ (5T2). We present a new model for the photorefractive effect in InP:Fe, which we use to interpret our beam-coupling results. Some material parameters of the InP:Fe sample and particularly of the excited state are deduced. The same energy-transfer measurements conducted in GaAs give us the ratio of hole and electron photoionization cross sections.
Transfer of temporal fluctuations between the signal and pump beams in diffusion dominated photorefractive two-beam coupling is studied experimentally. The dependence on the gain, beam intensity ratio, and frequency of the fluctuations is found to agree well with a linearized analysis. The transfer of perturbations is frequency dependent at low frequencies, and becomes constant at frequencies large compared to the inverse material time constant. We discuss the possibility of pump noise suppression when amplifying weak signals.