Spatial frequency dependence of the energy transfer in two-wave mixing experiments with BSO crystals |
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Authors: | H. Rajbenbach J.P. Huignard B. Loiseaux |
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Affiliation: | Thomson-CSF, Laboratoire Central de Recherches, Domaine de Corbeville, B.P. no. 10, 91401 Orsay, France |
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Abstract: | Energy transfer between two beams interfering in an electrooptic Bi12SiO20 crystal is analyzed as a function of the spatial frequency of the recorded hologram. We report high coefficients in a wide range of low spatial frequencies , when the drift length of the photocarriers becomes comparable to the fringe spacing. Exponential gain coefficients of Γ = 7 cm-1 have been reached for high intensity beams ratio (β > 104) and an optimized fringe displacement speed (moving grating recording). Application to coherent image amplification (×20) is shown. |
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