Photorefractive ac-enhanced nonlinear response of sillenites: Low- and high-contrast effects |
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Authors: | O Filippov KH Ringhofer BI Sturman |
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Institution: | (1) Physics Department of the University, 49069 Osnabrück, Germany, DE;(2) International Institute for Nonlinear Studies, Koptyg Ave 1, 630090, Novosibirsk, Russia, RU |
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Abstract: | Analytically and numerically we investigate the dependence of the first Fourier harmonics of the space-charge field, induced
in an AC-biased sillenite crystal by a light-interference pattern, on the light contrast m. It is shown that within the whole contrast range, 0 < m < 1, these dependences are controlled by the only scalar parameter - the space-charge wave quality factor Q. In the low-contrast limit, m Q
-2, this factor defines the degree of enhancement of the nonlinear response while for larger contrasts it characterizes strong
saturation effects. The data obtained are compared with the results of the previous studies of the AC-response. The possibilities
of experimental detection of predicted dependences and their possible implications are discussed.
Received 13 September 2002 / Received in final form 27 December 2002 Published online 11 February 2003 |
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Keywords: | PACS 42 65 Ky Frequency conversion harmonic generation including higher-order harmonic generation – 78 20 Bh Theory models and numerical simulation |
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