COHERENT LIGHT AMPLIFICATION AND OPTICAL PHASE CONJUGATION WITH PHOTOREFRACTIVE MATERIALS

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Abstract
The electric field and fringe spacing dependence of the stationary energy transfer between two writing beams in volume phase-hologram formation with photoconductive electro-optic materials (KNbO3:Fe2+, Bi12(Si,Ge)O20,...) has been studied. Experimental results are compared with the theoretical expressions describing the influence of the different photoinduced space-charge fields in photorefractive media. A peak exponential gain of Ɖ = 15 cm-1 has been reached in KNbO3:Fe2+ for the proper choice of experimental parameters such as recording wavelength, fringe spacing, applied electric field etc.). Results of the electric field dependence of the wavefront reflectivity ρ in degenerate four-wave mixing experiments are reported and discussed in terms of a similar theoretical treatment as the two-wave mixing experiments. It is shown, that peak reflectivities of ρ = 25 percent have been reached for KNbO3:Fe2+, that conjugate complex wavefronts can be generated and that distorted optical wave fronts can be effectively corrected by four-wave mixing experiments in KNbO3:Fe2+

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