Dynamic holograms and optical limiting: Asymmetric two-wave interactions |
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Authors: | D I Stasel’ko S V Kessel’ |
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Institution: | (1) Vavilov State Optical Institute All-Russia Research Center, St. Petersburg, 199034, Russia;(2) St. Petersburg State University of Information Technologies, Fine Mechanics, and Optics, St. Petersburg, 197101, Russia |
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Abstract: | The conditions for obtaining a high efficiency of energy exchange upon two-wave interactions in dynamic holograms are found by analysis and numerical simulation of a system of nonlinear equations. Use of an asymmetric scheme of beam interaction in a medium with two nonlinearities, one of which determines the amplitude and relaxation time of a grating and the other of which provides phase modulation of the interacting beams, is proposed. It is shown that such a scheme in combination with the specific properties of a medium makes it possible to radically reduce the requirements for the nonlinearity of a medium and the intensity of a light flux in limiting systems, as well as to significantly decrease the time of the transition process. As a result, it becomes possible to attain an efficiency of energy transfer higher than 90% and to increase the corresponding attenuation of a high-power beam by almost two orders of magnitude, which is of interest for optical limiting of intense light fluxes. |
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