[1] Segev M, Crosignani B, Yariv A, et al. Spatial solitons in photorefractive media [J]. Phys. Rev. Lett., 1992, 68(7): 923-926.

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

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

[4] Segev M, Valley G C, Bashaw M C, et al. Photovoltaic spatial solitons [J]. J. Opt. Soc. Am. B, 1997, 14(7): 1772-1781.

[7] Liu Jinsong, Lu Keqing. Screening-photorefractive spatial solitons in biased photovoltaic-photorefractive crystals and their self-deflection [J]. J. Opt. Soc. Am. B, 1999, 1(4): 550-555.

[10] Castro-camus E, Magana L F. Prediction of the physical response for the two-photon photorefractive effect [J]. Opt. Lett., 2003, 28(13): 1129-1131.

[11] Hou Chunfeng, Pei Yanbo, Zhou Zhongxiang, et al. Spatial solitons in two-photon photorefractive media [J]. Phys. Rev. A, 2005, 71(5): 053817.

[12] Hou Chunfeng, Zhang Yu, Jiang Yongyuan, et al. Photovoltaic solitons in two-photon photorefractive materials under open-circuit conditions [J]. Opt. Commun., 2007, 273(2): 544-548.

[13] Zhang Yu, Hou Chunfeng, Sun Xiaodong. Grey spatial solitons due to two-photon photorefractive effect [J]. Chin. Phys., 2007, 1(1): 159-164.

[15] Zhang guangyong, Liu Jinsong. Screening-photovoltaic spatial solitons in biased two-photon photovoltaic photorefractive crystals [J]. J. Opt. Soc. Am. B, 2009, 2(1): 113-120.

[16] Chen L J, Partovi A. Temperature and intensity dependence of photorefractive effect in GaAs [J]. Appl. Lett., 1986, 49(21): 1456-1458.