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Nonlinearity of a response in photorefractive crystals with a square-wave applied field |
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| Authors: | SM Shandarov NI Nazhestkina OV Kobozev AA Kamshilin |
| Institution: | (1) Department of Electronic Devices, State University of Control Systems and Radioelectronics, 40 Lenin Avenue, Tomsk 634050, Russia (Fax: +7-3822/414-321, E-mail: shand@stack.ru), RU;(2) Department of Physics, University of Joensuu, P.O. Box 111, FIN-80101, Joensuu, Finland, FI |
| Abstract: | The space-charge-field formation in a photorefractive crystal illuminated by a one-dimensional light pattern is studied when an alternating square-wave electric field is applied to the crystal. We derive the general nonlinear equation for the time-averaged distribution of the space-charge field and employ the simplified versions of this equation to analyze the space-charge-field formation in the case of a Gaussian beam and interference light pattern. The borders of the applicability of simplified equations and analytic expressions to describe a self-action of light beams and the large modulation effects under two-beam coupling are estimated from the numerical calculations. Received: 18 November 1998 / Revised version: 26 January 1999 / Published online: 12 April 1999 |
| Keywords: | PACS: 42 65 Hw 42 70 Nq |
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