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10 May 2012 Surface wave and its modulation instability in SBN-61
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Photorefractive nonlinear optical surface guided wave (SGW) excitation as a result of laser beams internal reflection from single-domain strontium barium niobate crystal (SBN-61) surface was demonstrated experimentally. We determined theoretically and experimentally SGW's transverse intensity distribution and recognized that SBN's biased dc electric field and background lateral illumination have forcible impact on SGW formation. For our opinion this experiment was the first when it was demonstrated that SGW stable stationary existence is limited by processes of transversal modulation instabilities (MI). MI drives SGW into an unexpected regime of propagation in which beam fragmented on to stochastic periodical pattern of bright spots. MI is aroused if biased dc electric field exceeds the threshold. Value of biased dc electric field and intensity of background lateral illumination determines spatial scale of the MI fragments.
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Sergey A. Chetkin "Surface wave and its modulation instability in SBN-61", Proc. SPIE 8434, Nonlinear Optics and Applications VI, 84341A (10 May 2012);

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