8 August 1989 Photorefractive Optics At Near-Infrared Wavelengths
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Measurements of two-wave mixing gain and phase-conjugate response in barium titanate using GaAlAs diode laser sources emitting at 830 nm are discussed. Gain coefficients as large as 18 cm-1 have been obtained with optimized mixing geometries. With an optically isolated barium titanate ring passive phase-conjugate mirror we have obtained phase-conjugate reflectivities as large as 56% (uncorrected for Fresnel reflection losses) and response times on the order of tens of seconds. These results represent significant improvements over corresponding values previously reported in the literature.
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P. H. Beckwith, P. H. Beckwith, W R Christian, W R Christian, I. C. McMichael, I. C. McMichael, P. A. Yeh, P. A. Yeh, } "Photorefractive Optics At Near-Infrared Wavelengths", Proc. SPIE 1060, Nonlinear Optical Beam Manipulation and High Energy Beam Propagation Through the Atmosphere, (8 August 1989); doi: 10.1117/12.951733; https://doi.org/10.1117/12.951733

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