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Chinese Physics Letters

Observation of Self-Pumped Phase Conjugation for Two Mutually Coherent Input Beams in a KNSBN Crystal

Xiaoguang Wu, Xierong Hu, Zhongsu Shao, Huanchu Chen, Song Yongyuan

Published Jun 1, 1993• 1 citation
Publisher

Abstract

Two coherent or incoherent stable self-pumped phase conjugations have been obtained simultaneously in a Ce-doped (K 0.5 Na 0.5 ) 2y (Sr 0.61 Ba 0.39 ) 1-y Nb 2 O 6 (KNSBN) crystal by using two mutually coherent input beams from a He-Ne laser, and energy translation from one beam to another induces self-pumped phase conjugative reflectivity of one beam above 100%.

DOI
10.1088/0256-307x/10/6/006

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Optics Letters•Apr 15, 1991•20 citations
Two coherent or incoherent stable self-pumped phase conjugations have been obtained simultaneously in a Ce-doped (K 0.5 Na 0.5 ) 2y (Sr 0.61 Ba 0.39 ) 1-y Nb 2 O 6 (KNSBN) crystal by using two mutually coherent input beams from a He-Ne laser, and energy translation from one beam to another induces self-pumped phase conjugative reflectivity of one beam above 100%.
We report for the first time a double 45°-cut mutually pumped phase conjugate mirror, which has high phase conjugate reflectivities and is highly insensitive to the alignment of the two incident beams. For example, two mutually incoherent incident beams can produce their own phase conjugate outputs when the angle between the incident beams is varied from as much as 7° to 140° and over 60% conjugate reflectivity can be obtained. Furthermore, the phase conjugate outputs are stable because the competition from the self-pumped phase conjugation can be avoided easily.
Photorefractive self-pumped phase conjugation is attractive for its simplicity and high reflectivity with low-power light sources. In order to realize its potential applications, it is important to study its response. So far the response of a phase-conjugate wave has been described with its rise time. It has not studied how the phase-conjugate wave responds when the spatial structure of an input probe wave is changed dynamically. We investigated the response of the phase conjugate wave by using two mutually coherent input beams, which can be regarded as components of a probe wave, and by introducing sinusoidal phase changes into one of them with varied frequencies. Each input beam has a power of 6 mW at the wavelength of 515 nm. A BaTiO3 crystal was employed as a self-pumped phase-conjugate mirror.1 By measuring relative phase between the two output beams, which can be regarded as components of a phase-conjugate wave, we found the response characteristic represented by a time-lag of first order, which is similar to RC circuit. The response time thus determined was 0.32 s, which was much shorter than the rise time of 30 s obtained with the same condition.
We present the results of an experimental study of the effects of laser coherence on the operation of the double phase-conjugate mirror using barium titanate as the nonlinear medium. In our experiment the two input beams that drive the interaction originate from a single helium-neon laser, and the degree of coherence between the input beams at the crystal is varied through the use of a time-dependent phase delay in one of the beam paths. As the two input beams make the transition from being mutually incoherent to mutually coherent, the phase-conjugate reflectivity decreases dramatically and becomes unstable. These results are significant to laser phase-locking applications where changes in the coupling intensity can affect the quality of phase locking.