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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

One-way aberration-free image communication through a phase-disturbing medium using photorefractive four-wave mixing

Jingjun Xu, Guangyin Zhang, Simin Liu, Qian Sun, Guoquan Zhang, Qiyin Fang, Chaoli Ma

Published Aug 18, 1995• 0 citations
Publisher

Abstract

In this paper, we introduce a new technology for picking-up images and one-way aberration- free image communication through a phase-disturbing medium using photorefractive four- wave mixing and theoretically analyze this photorefractive process using the photorefractive four-wave coupling equations. We also experimentally realize this operation in the LiNbO3:Fe crystal.

DOI
10.1117/12.217016

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In this paper, we introduce a new technology for picking-up images and one-way aberration- free image communication through a phase-disturbing medium using photorefractive four- wave mixing and theoretically analyze this photorefractive process using the photorefractive four-wave coupling equations. We also experimentally realize this operation in the LiNbO3:Fe crystal.
The slowing down of light pulses with backward-wave four-wave mixing is analyzed for photorefractive crystals with different coupling strengths. The conditions are found for which the delay of a phase-conjugate pulse decreases when the coupling strength increases and can even become negative, switching the pulse deceleration to acceleration. It is shown that for relatively low coupling strength the backward-wave four-wave mixing ensures a longer delay as compared to the two-beam-coupling technique. For coupling strengths tending to zero, the delay of long pulses approaches the response time of the medium. The conclusions of the theoretical analysis are confirmed experimentally with backward-wave four-wave mixing in barium titanate.
A theoretical model is constructed for four-wave mixing in a photorefractive crystal where a transmission grating is formed by the drift–diffusion nonlinearity mechanism in the absence of an external electrostatic field and the response of the medium is nonlinear in respect of the modulation parameter. A comparison is made with a model in which the response of the medium is linear in respect of the modulation parameter. Theoretical models of four-wave and two-wave mixing are also compared with experiments.
Stationary photorefractive self-pumped phase-conjugation with one four-wave-mixing interaction region, stimulated by the photorefractive amplified backward scattering, is obtained in LiNbO 3 :Fe crystals, in which the strong backward scattered light is gotten by putting a scattering particle on the backface of the sample. Even though its reflectivities are not high (its temporal and stationary reflectivities are 10% and 3%, respectively), due to the low electrooptic coefficients of LiNbO 3 :Fe crystals, our experimental results prove that this mechanism is effective and simple comparing with the "cat" self-pumped phase-conjugator.