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Chinese Physics Letters

One-way image transmission through multi-layer of thin distorting media

Lin Hong, Zhang Hong-jun, Jianhua Dai

Published Sep 1, 1986• 0 citations
Publisher

Abstract

In this article we discuss the problem of one-way image transmission through multi-layer of thin distorting media: a special case of thick distorter. We prove the possibility of transmitting image through two layers, as well as multi-layer, of thin distorting media via degenerate four-wave mixing. The theoretical analysis is verified by the experimental results for two thin distorters.

DOI
10.1088/0256-307x/3/9/001

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In this article we discuss the problem of one-way image transmission through multi-layer of thin distorting media: a special case of thick distorter. We prove the possibility of transmitting image through two layers, as well as multi-layer, of thin distorting media via degenerate four-wave mixing. The theoretical analysis is verified by the experimental results for two thin distorters.
A systematic study of degenerate two-wave mixing in the stationary regime in thin nonlinear local-response media is presented. The model is based on the coherent interaction of four waves, the two incident beams, and the two main diffracted waves. Analytical results are obtained in all cases investigated under the assumption of weak-beam amplification. It is demonstrated that the energy transfer arises only from the forward degenerate four-wave mixing terms. In particular, the theoretical results show two new features: (1) the gain factor of the interaction is substantially reduced because of the phase change associated with the two-wave mixing terms and (2) a phase mismatch can compensate for this phase change, leading to an appreciable gain enhancement. Moreover, the general case is solved numerically. Particular attention is given to the influence of separate two-wave and forward degenerate four-wave mixing terms. Self-diffraction effects and the gain dependence versus the ratio of the pump-beam intensity to the signal-beam intensity are investigated.