We study experimentally the Bloch-wave instabilities in optically induced photonic lattices. We reveal two different instability scenarios associated with either the transverse modulational instability of a single Bloch wave or the nonlinear interband coupling between different Bloch waves. We show that the transverse instability is greatly enhanced in the induced lattice in comparison with homogeneous media.
© 2004 Optical Society of America
Dragomir Neshev, Andrey A. Sukhorukov, Yuri S. Kivshar, and Wieslaw Krolikowski, "Observation of transverse instabilities in optically induced lattices," Opt. Lett. 29, 259-261 (2004)