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Optics Letters

Transient picosecond response of the photorefractive effect in InP:Fe

Hongwei Mao, Ximing Deng, Fuming Li

Published Aug 15, 1990• 3 citations
Publisher

Abstract

The time lag of the crossed-polarized part of the transmitted probe pulse, which is due to photorefractive energy transfer from the pump pulse, is measured with respect to the original transmitted probe pulse. The average photorefractive response time of the crystal is estimated through theoretical analysis.
DOI
10.1364/ol.15.000888

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Induced absorption was observed in an InP:Fe crystal under nanosecond pulse illumination at 1.06- mu m wavelength. The maximum induced absorption was 0.05 cm/sup -1/ when probed at a 1.06- mu m wavelength and 0.30 cm/sup -1/ when probed at a 1.30- mu m wavelength. The kinetics are studied together with the photocurrent giving the recombination times of holes (100 ns) at room temperature and an estimate for that of electrons (0.5 ns). The induced absorption is attributed to a population redistribution of the different iron impurity states. Computer simulations are able to explain all the features found in the experiments and give values for the photoionization cross sections, in particular for the unknown cross section Fe/sup 2+*/ to Fe/sup 3+/+e/sup -/.>