Abstract

The electric-field dependence of the wave-front reflectivity ρ in degenerate four-wave mixing experiments with reduced KNbO₃ and Bi₁₂GeO₂₀ has been measured and compared with the theoretical expressions [N. Kukhtarev et al., Ferroelectrics 22, 949, 961 (1979)] describing the influence of the different photoinduced space-charge fields in photorefractive media. Peak reflectivities of ρ = 1.4% for Bi₁₂GeO₂₀ and ρ = 10% for KNbO₃:Fe²⁺ have been reached for field strengths of 12 and 8 kV/cm, respectively. It is shown that complex-conjugate wave fronts can be generated and that distorted optical wave fronts can be effectively corrected by degenerate four-wave mixing experiments in KNbO₃:Fe²⁺.

© 1982 Optical Society of America

Phase-conjugation and spatial-frequency dependence of wave-front reflectivity in Bi₁₂SiO₂₀ crystals

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