双光子光折变晶体串联回路中屏蔽空间孤子对

Screening soliton pairs in a biased series two-photon photorefractive crystal circuit

提出了在由两块双光子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屏蔽空间孤子对的理论.在适当的条件下,导出了在晶体回路中两光束传播的耦合方程.证明了在回路中存在暗-暗、明-暗和明-明双光子屏蔽孤子对.研究结果表明,孤子对中的两孤子通过光电流能相互影响,它们的耦合能影响到另一个孤子的空间包络、动态演化和稳定性.在光束的空间展宽远小于晶体宽度的极限条件下,暗孤子通过光电流能影响明孤子,但明孤子不能影响暗孤子.对于明-暗孤子对,调节暗孤子的强度能够影响明孤子的传播特性.

This paper presents an idea for the photorefractive spatial soliton, namely, screening solitons form in a biased series two-photon photorefractive crystal circuit consisting of two photorefractive crystals connected electronically by electrode leads in a chain with a voltage source. A system of two coupled equations is derived under appropriate conditions for two-beam propagation in the crystal circuit. The existence of dark-dark, bright-drak and bright-bright two-photon screening soliton pairs in such a circuit is proved. The results show that the two solitons in a soliton pair can affect each other by the light-induced current and their coupling can affect their spatial profiles, dynamical evolutions and stablilities. Under the limit in which the optical wave has a spatial extent much less than the width of the crystal, only the dark soliton can affect the other soliton by light-induced current, but the bright soliton cannot. The dynamical evolution of bright soliton in one crystal can be modulated by changing the intensity of the dark soliton in the other crystal in the circuit.