Light-induced self-defocusing property in tetragonal tungsten bronze crystals by Ch. Y. Gao, H. R. Xia, J. Q. Xu, Sh. Ch. Si, H. J. Zhang, J. Y. Wang, and H. L. Song

Crystal Research and Technology

Cryst. Res. Technol. 42, 384 (2007) - Abstract -

Light-induced self-defocusing property in tetragonal tungsten bronze crystals

Ch. Y. Gao, H. R. Xia, J. Q. Xu, Sh. Ch. Si, H. J. Zhang*, J. Y. Wang*, and H. L. Song*

School of Physics and Microelectronics of Shandong University, Jinan, 250100, P. R. China
*Institute of Crystal Materials, Shandong University, Jinan, 250100, P. R. China

Keywords	refractive index, soliton, self-defocusing, Michelson interference
PACS	42.70.-a, 77.84.-s, 42.65.-k, 77.80.-e
DOI	10.1002/crat.200610832

In open-circuit boundary conditions, tetragonal tungsten bronze (CSBN75) crystals are settled on one of arms of Michelson’s interferometer in such a way that even minor perturbation of the penetrated beam can be enlarged and observed through the Michelson’s interferometer rings. The experimental results shows that CSBN75 (Δn<0) are self-defocusing photorefractive crystals. In this paper, qualitative and quantitative discussion on the light-induced change in the index of refraction is given. The self-defocusing character in CSBN75 suggests that it is possible to observe the dark spatial solitons with this crystal in further investigation.

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