双光子光折变晶体串联回路中独立屏蔽光伏孤子对

Separate Screening-Photovoltaic Soliton Pairs in Series Two-Photon Photorefractive Crystal Circuit

提出了在由两块双光子光伏光折变晶体和一个电源通过导线串联而成的回路中存在双光子独立屏蔽光伏空间孤子对的理论.在适当的条件下导出了两光束在晶体回路中传播的耦合方程。证明了在回路中存在暗-暗、明-暗和明-明双光子独立屏蔽光伏空间孤子对。在光束的空间展宽远小于晶体宽度的极限条件下,对每种孤子对中两孤子相互作用的研究表明,暗孤子通过光电流能影响孤子对中另一孤子,但明孤子不能影响另一孤子。

An idea is presented for the photorefractive spatial soliton,namely,screening-photovoltaic solitons pairs in a biased series two-photon photovoltaic photorefractive crystal circuit consisting of two photorefractive crystals connected electronically by electrode leads in a chain with a voltage source.A set of two coupled equations is derived under appropriate conditions for two-beam propagation in the crystal circuit.The existence of dark-dark,bright-dark and bright-bright two-photon screening-photovoltaic soliton pairs in such a circuit is proved.Studies on the interaction between two solitons in one soliton pair show that only the dark soliton can affect the other by light-induced current,whereas the bright one cannot.The asymmetry result comes from the limit in which the spatial extent of the optical beam is much less than the width of the crystal.