Coherent Image Amplification And Optical Phase Conjugation With Photorefractive Materials

P. Gunter

doi:10.1117/12.934373

16 June 1983 Coherent Image Amplification And Optical Phase Conjugation With Photorefractive Materials

P. Gunter

Proceedings Volume 0369, Max Born Centenary Conf; (1983) https://doi.org/10.1117/12.934373
Event: The Max Born Centenary Conference, 1982, Edinburgh, United Kingdom

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 (KNb03:Fe2+, Bi12(Si,Ge)020,...) 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 Γ= 15 cm-1 has been reached in KNb03: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 KNb03:Fe2+, that conjugate complex wavefronts can be generated and that distorted optical wave-fronts can be effectively corrected by four-wave mixing experiments in KNb03:Fe2+.

Citation Download Citation

P. Gunter "Coherent Image Amplification And Optical Phase Conjugation With Photorefractive Materials", Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); https://doi.org/10.1117/12.934373

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