Electric-field dependence of phase-conjugate wave-front reflectivity in reduced KNbO(3) and Bi(12)GeO(20).
The electric-field dependence of the wave-front reflectivity rho in degenerate four-wave mixing experiments with reduced KNbO(3) and Bi(12)GeO(20) 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 rho = 1.4% for Bi(12)GeO(20) and rho = 10% for KNbO(3):Fe(2+) 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 KNbO(3):Fe(2+).
Günter
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