Low frequency peculiarities of the photorefractive response in sillenites


We investigate experimentally and theoretically the dependence of the amplitude of the spatial fundamental grating, created by a pair of coherent light beams while using the running grating technique [M.P. Petrov, S.I. Stepanov and A.V. Khomenko, Photorefractive Crystals in Coherent Optical Systems, Springer Series in Optical Sciences (Springer, 1991); P. Refregier, L. Solymar, H. Rajbenbach and J.P. Huignard, J. Appl. Phys. 58 (1985) 45], as a function of detuning frequency and beam ratio ß in photorefractive Bi12SiO20. It is shown that for ß > 0.05, in addition to the main peak in the frequency dependence of the amplitude, there is an additional peak of lower frequency which, as a rule, dominates the main peak. The position of the main peak depends on ß. The experimental results are in good agreement with the theoretical analysis and the general ideas about excitation and nonlinear interaction of weakly damped space-charge waves.

Uncontrolled Keywords: dependence, amplitude, spatial fundamental grating, coherent light beams, running grating technique, detuning frequency, beam ratio β, photorefractive Bi12SiO20
Publication ISSN: 0030-4018
Last Modified: 23 Oct 2019 11:28
Date Deposited: 04 May 2011 10:32
Published Date: 1995-01-01
Authors: McClelland, T.E.
Webb, David J.
Sturman, B.I.
Mann, M.
Ringhofer, K.H.


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