亮暗屏蔽光伏孤子在LiNbO3晶体中的大自偏转

用数值方法证实了亮、暗屏蔽光伏孤子在有外加电场的LiNbO₃晶体中都可以发生大自偏转，并验证了这种自偏转现象不但与晶体中受主浓度N_A有关而且还与外加电场E₀有关. 在E₀相同的条件下，N_A越小这种自偏转现象越明显，在N_A相同的条件下，E₀越大自偏转现象越明显. 还发现亮、暗屏蔽光伏孤子的自偏转现象不同：亮屏蔽光伏孤子整体都发生明显偏转，暗屏蔽光伏孤子的偏转只是发生在一侧，其极值位置和另一侧几乎不发生偏转. 关键词： 自偏转 空间孤子 光折变效应

Large self-deflection of bright and dark screening photovoltaic solitons in LiNbO3

We demonstrate large self-deflection of both bright and dark screening photovoltaic solitons existing in LiNbO₃ crystal under an external applied field with numerical method, and we also demonstrate that the self-deflection is not only connected with the acceptor concentration N_A but also with the external applied field E₀. Under the same E₀, when N_A is lower, the self-deflection is more obvious. Under the same N_A, when E₀ is higher, the self-deflection is more obvious. We also find that self-deflection of the bright screening spatial soliton and that of the dark one are different: the bright screening photovoltaic soliton deflects obviously; while only one side of the dark soliton deflects, its extreme value point and the other side almost do not deflect.