双光子光折变屏蔽光伏亮孤子相互作用研究

Interaction of two-photon photorefractive screening-photovoltaic bright spatial solitons

为了得到双光子光折变屏蔽光伏亮孤子相互作用的结果,采用数值模拟方法,对外加电场的双光子光伏光折变介质中屏蔽光伏亮孤子的相互作用进行了理论研究。结果表明:同相位的两孤子相互吸引,并伴有融合现象,且发生融合时的作用距离随孤子初始间距的增大而增大;相位相反的两孤子相互排斥,排斥作用随孤子初始间距的减小而增强;当两孤子的相位差位于区间(0,π)和(π,2π)中时,其作用过程中伴有能量的转移,两区间中能量转移方向相反。在扩散效应影响下,同相位两孤子的相互作用不再是原来的融合,而是趋于分离,且光束之间存在能量耦合;相位相反的两孤子的相互作用不再是相互排斥,而是既互相排斥,同时又向同侧偏转。

In order to obtain results of interaction of two-photon photorefractive sreening-photovoltaic bright spatial solitons, the interactions of two-photon screning-photovoltalc bright spatial soliton in biased two-photon photovoltalc phptorefractive crystals were numerically investigated. The result shows that two in-phase solitons attract each other and soliton fusions do occur at certain interaction length, which increases monotonously with the initial separation of the two interacting solitons. While in the case of out-of-phase, both the two-solitons repel each other with a force decreasing monotonously with the initial separation. When the relative phase between the solitons falls within the ranges of （0, 7π） and （π, 27π）, energy transfer accompanies the interactions. The in-phase interaction results in the separation of the two solitons beams from each other, accompanied by the energy coupling between the beams, which is different from the case without diffusion field. And for the case of out-of-phase interaction, the two solitons are no longer separated simply, they are exclusive to each other but deflect simultaneously to the same side.