PHOTOREFRACTIVE SURFACE GRATING IN BATIO3

Авторы: Kirillov A.M., Shandarov S.M., Burimov N.I.
Сборник: Proceedings of the 6th International Scientific and Practical Conference of Students, Post-Graduates and Young Scientists: Modern Techniques and Technology, MTT 2000
Год издания: 2000
Первая страница: 162
Последняя страница: 164
DOI: 10.1109/SPCMTT.2000.896099
Аннотация: We present the theoretical model of a photorefractive surface grating in Z-cut of BaTiO/sub 3/ crystal at steady state. Taking the crystal surface to be traction free we consider two cases: (a) dielectric boundary and (b) short-circuited (metallized) boundary. The analysis shows that the photorefractive grating near the crystal boundary has a complex structure. It can be shown that the crystal boundary and the electric boundary conditions have a large influence on the changes in the dielectric tensor induced by a photorefractive grating. Near the crystal surfaces, the changes in the dielectric tensor are different from their volume values, it gives rise to diffraction processes which are forbidden for a bulk grating. One should take elastic contribution into account when calculating the gain expected in photorefractive waveguides or in any case in which light beams travel near the surface of a photorefractive crystal.
Добавил в систему: Кириллов Андрей Михайлович

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