The shape of two-dimensional solitary beams propagating in photorefractive media with an externally applied field is studied. The analytical results indicate that, for both focusing and defocusing nonlinearities, radially symmetric self-channeled beams do not exist. Some recent experiments are interpreted in light of the present results.
© 1998 Optical Society of America
M. Saffman and A. A. Zozulya, "Circular solitons do not exist in photorefractive media," Opt. Lett. 23, 1579-1581 (1998)