[1] Chiao R Y, Garmire E, Townes C H. Self-trapping of optical beams. Phys. Rev. Lett., 1964, 13(15): 479～482

[2] Maneuf S, Reynaud F. Quasi-steady state self-trapping of first, second and third order subnanosecond beams. Opt. Commun., 1998, 66(5,6): 325～328

[3] Barthelemy A, Maneuf S, Frochly C. Propagation soliton et auto-confinement de faisceaux laser par non linearite optique de kerr. Opt. Commun., 1985, 55(3): 201～206

[4] Maneuf S, Desailly R, Frochly C. Stable self-trapping of laser beams: Observation in a nonlinear planar waveguide. Opt. Commun., 1988, 65 (3) :193～198

[5] Duree G C, Shultz J L, Sharp G J et al.. Observation of self-trapping of an optical beam due to the photorefractive effect. Phys. Rev. Lett., 1993, 71 (4) :533～536

[6] She W L, Lee K K, Lee W K. Observation of two-dimensional bright photovoltaic spatial solitons. Phys. Rev. Lett., 1999, 83 (16) :3182～3185

[7] Liu J S, Lu K Q. Screening-photovoltaic spatial solitons in biased photovoltaicphotorefractive crystals and their self-deflection. J. Opt. Soc. Am. (B), 1999, 16(4): 550～555

[8] Hou C F, Li Y, Yuan B H. Low-amplitude screening-photovoltaic spatial solitons in biased photovoltaic photorefractive crystals. Chin. J. Laser (B), 2000, 9 (6): 551～557

[9] Christodoulides D N, Coskun T H. Incoherent spatialsolitons in saturable nonlinear media. Opt. Lett., 1997, 22(14): 1080～1082

[10] Krolikowski W, Edmundson D, Bang O. Unified model for partially coherent solitons in logarithmically nonlinear media. Phys. Rev. (E), 2000, 61 (3): 3122～3126

[11] Snyder A W, Mitchell J D. Mighty morphing spatialsolitons and bullets. Opt. Lett., 1997, 22 (1) :16～18

[12] Christodoulides D N, Carvalho M I. Bright, dark, and gray spatial soliton states in photorefractive media. J. Opt. Soc. Am. (B), 1995, 12 (9) :1628～1633