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Proceedings Paper

Coherent Image Amplification And Optical Phase Conjugation With Photorefractive Materials
Author(s): P. Gunter
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Paper 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+.

Paper Details

Date Published: 16 June 1983
PDF: 7 pages
Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); doi: 10.1117/12.934373
Show Author Affiliations
P. Gunter, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 0369:
Max Born Centenary Conf
M. John Colles; D. William Swift, Editor(s)

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