[1] SEGEV M, VALLEY G C, CROSIGNANI B, et al. Steady-state spatial screening solitons in photorefractive materials with external applied field［J］. Physical Review Letters, 1994, 73(24): 3211-3214.
[2] GAO C Y, XU J Q, FENG G F, et al. Dynamic behavior of spatial bright solitons in a biased transversely shifting photorefractive crystal［J］. Applied Physics B, 2012, 107(3): 779-784.
[3] ZHANG G Y, LIU J S, LIU S X, et al. The self-deflection of photovoltaic bright spatial solitons on the basis of higher-order space-charge field［J］. Journal of Optics, 2006, 8(5): 442-446.
[4] CHRISTODOULIDES D N, SINGH S R, CARVALHO M I, et al. Incoherently coupled soliton pairs in biased photorefractive crystal［J］. Applied Physics Letter, 1996, 68(13):1763-1765.
[5] SU Y L, JIANG Q C, JI X M, et al. Incoherently coupled spatial soliton families in photorefractive polymers［J］. Optics and Laser in Engineering, 2011, 49(4): 526-529.
[6] CROSIGNANI B, DELRE E, PORTO P, et al. self-focusing and self-trapping in unbiased centrosymmetric media［J］. Optics Letters, 1998, 23(12): 912-914.
[7] ZHAN K Y, HOU C F, TIAN H, et al. Spatial solitons in centrosymmetric photorefractive crystals due to the two-photon photorefractive effect［J］. Journal of Optics, 2010, 12(1): 015203.
[8] ZHAN K Y, HOU C F, TIAN H, et al. Incoherently coupled Gaussian soliton pairs in biased centrosymmetric photorefractive crystals［J］. Optics and Laser Technology, 2010, 42(7): 11761179.
[9] ZHAN K Y, HOU C F, ZHANG Y. Incoherently coupled spatial soliton families in centrosymmetric two-photon photorefractive crystals［J］. Journal of Optics, 2010, 12(3): 035208.
[10] WAN X M, WANG D Y, ZHAO X Y, et al. Electro-optic characterization of tetragonal PMN-PT single crystal by a modified Senarmont setup［J］. Solid State Communications, 2005, 134(8): 547-551.
[11] JIA H, SUN L. Photorefractive effect of ion-doped PMN-PT single crystal［J］. Scientia Sinica Physica, Mechanica & Astronomica, 2012, 42(4): 333-338.
[12] ZHANG R, JIANG B, CAO W W. Elastic, piezoelectric, and dielectric properties of multidomain PMN-0.33PT single crystals［J］. Journal of Applied Physics, 2001, 90(7): 3471-3475.
[13] HAO L L, WANG Q, HOU C F. Spatial solitons in biased photorefractive materials with both the linear and quadratic electro-optic effects［J］. Journal of Modern Optics, 2014, 61(15): 1236-1245.
[14] HAO L L, WANG Q, HOU C F. Incoherently coupled spatial soliton pairs due to both the linear and quadratic electro-optic effects［J］. Journal of Modern Optics, 2015, 62(3): 205-211.
[15] HAO L L, WANG Q, HOU C F. Temperature effects on (1+1)-dimensional steady-state bright spatial solitons in biased photorefractive crystals with both the linear and quadratic effects［J］. Journal of Modern Optics, 2016, 63(10): 1000-1008.
[16] JIANG Q C, SU Y L. New type spatial soliton pairs based on two-photon photorefractive effect［J］. Acta Photonica Sinica, 2015, 44(9): 0919001.
