从理论上研究了有偏压的光伏光折变晶体中低振幅屏蔽光伏孤子对的特性,给出了明-明、暗-暗屏蔽光伏孤子对的单孤子解。它们起源于对外电场的非均匀空间屏蔽和光伏效应,不同于起源于对外电场非均匀空间屏蔽孤子和起源于光伏效应的光伏孤子,具有有趣的特性。当光伏效应可忽略时,它们的非线性波动方程就转化为低振幅屏蔽孤子对的非线性波动方程,它们就转化为低振幅屏蔽孤子对;当外偏压为零时,它们的非线性波动方程就转化为低振幅闭路和开路光伏孤子对的非线性波动方程,它们就转化为低振幅闭路和开路光伏孤子对。如果载体光束具有相同的偏振和波长以及互不相干时,这些孤子对就能得到,相关的例子在光伏光折变晶体铌酸锂(LiNbO3)中给出。

A theory on incoherently coupled low-amplitude soliton pairs for screening-photovoltaic solitons in biased photorefractive-photovoltaic crystals is investigated that gives rise to the analytical solutions of bright-bright and dark-dark soliton pairs, which are due to both the spatially nonuniform screening of the external electric field and the photovoltaic effect. These soliton pairs, differ from screening soliton pairs originating from the spatially nonuniform screening of the external electric field and photovoltaic soliton pairs originating from the photovoltaic effect, are of interesting properties. When the photovoltaic effect is neglected, their nonlinear wave equations change into that for screening solitons, and these soliton pairs change into screening soliton pairs. When the external bias field is absent, their nonlinear wave equation change into that for photovoltaic solitons in closed and open circuits, and these soliton pairs change into photovoltaic soliton pairs in closed and open circuits. If the carrier beams share the same polarization, wavelength, and are mutually incoherent, these soliton pairs can be obtained. Relevant examples are provided where the photorefractive-photovoltaic crystal is lithium niobate (LiNbO3) crystal.