双光子光折变晶体中全息屏蔽空间孤子

Holographic Screening Soliton in Biased Two-photon Photorefractive Crystal

为了得到双光子光折变晶体中全息屏蔽空间孤子的结果,基于双光束耦合耗散系统和双光子光折变效应,证明了外加偏压的双光子光折变晶体中存在一种新的全息屏蔽空间孤子。此类孤子需要满足两种平衡,一是损耗与增益之间的平衡,增益由抽运光通过两波耦合为信号光提供;二是衍射与非线性之间的平衡,非线性包括外加电场的非均匀屏蔽和两波耦合对折射率的周期性调制。在信号光远小于抽运光的条件下得出了全息亮和暗孤子的解析表达式。研究了全息屏蔽孤子的演化特性。

A new two-photon holographic screening soliton in biased photorefractive materials is demonstrated based on the two-wave coupling dissipative systems and two-photon photorefractive effect to study the holographic screening soliton in a biased two-photon photorefractive crystals.Two types of balances need to be reached.Loss is balanced by gain provided by the pump beam via two-wave mixing,and diffraction is balanced by nonlinearity that is due to the spatially nonuniform screening of the applied field and the periodic modulation of the refractive index via two-wave mixing.The bright and dark analytical solutions are obtained under the condition that the signal beam is much weaker than the pump beam.Dynamical evolutions of holographic two-photon screening soliton are numerically simulated under stable condition.