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Acta Optica Sinica

Optical interferometry using degenerate two-wave mixing with photorefractive crystal LiNbO_3:Fe

Qiuyu Shang

Published Jan 1, 1991• 0 citations
OpenAlex

Abstract

Dynamic characteristics of degenerate two-ware mixing (TWM) in photorefra-otive media are theoritically analyzed. The applied principle of TWM in realtime interferometry is disscussed with deduced formula. The optical arrangement for experiment by using LiNbO3:Fe crystal is presented. Some experimental results are given.

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Forward Phase-Conjugate Wave in Degenerate Four-Wave Mixing (DFWM) in Photorefractive Crystalline Slab

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Photorefractive Effects, Materials, and Devices•Jan 1, 1991•0 citations
Both backward and forward phase conjugate waves have been observed indegenerate four-wave mixing (DFWM) in a LiNbO 3 :Fe crystalline slab. Investigation shows that the observed forward phase conjugate wave consists of two main contributions. The dominant contribution is the phase conjugate wave of the reflected signal beam. The other contribution arises from the reflection of backward phase conjugate wave at the front surface of the crystal. The intensity of the forward phase conjugate wave is comparable with that of the backward phase conjugate wave.
This paper demonstrates dual-frequency phase conjugation waves via the high-order nonlinear effect by nondegenerate six-wave mixing in iron-doped lithium niobate. In the experiment, two conjugation waves of different frequency are generated. Conjugation wave 1 is similar to nondegenerate four-wave mixing; conjugation wave 2 is completely different. The experiments measure the relationships between two conjugation wave intensities and parameters, respectively, and compare the differences of the two conjugation waves. To explain the experimental results, we assume that there is a fifth-order nonlinear interaction in crystal, and we believe the two conjugation waves are generated via different level nonlinear interactions. The theory agrees with the experimental results.
DFWM as an useful tool to generate phase conjugate waves has recently been the subject of intensive study. In particular photorefractive crystals such as LiNbO3, KNbO3, BaTiO3 and SBN are widely used[1]. Among the published papers on DFWM most are concerned with backward phase conjugate waves and only a few with forward phase conjugate, waves.[2,3] In both of these papers the intensity of the forward phase conjugate wave has not been investigated. We report here a systematic study of the intensity of forward phase conjugate wave.