| Abstract: | 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. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
