证明在外加电场的双光子光伏光折变晶体中存在明、暗稳态空间孤子波,它源于双光子光折变效应.结果表明:当光伏效应可以忽略时,这种孤子类似于双光子屏蔽孤子;当没有外加电场时,它退化成闭路条件下的双光子光伏孤子.在不同条件下屏蔽孤子和光伏孤子理论都可以从这一理论中得到.
Steady-state bright (dark) spatial solitons are predicted for biased two-photon photovoltaic pho-torefractive media, which are due to two-photon photorefractive effect. When the photovoltaic effect is neglectable, these solitons are just like the two-photon screening solitons. If the applied field absent, these solitons degenerate to the two-photon photovoltaic solitons under the close-circuit condition. Screening solitons and photovoltaic solitons theories can be obtained by simplifying this theory under the appropriate conditions.
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