高斯光束在有外电场的中心对称光折变材料中的演化

Evolution of Gauss Beam in Biased Centrosymmetric Photorefractive Media

为了研究在有外电场的中心对称光折变材料中一束高斯光束及两束高斯光束相互作用的演化,将高斯光束作为入射波,采用数值方法求解波传播方程。结果表明,当外加电场,光强峰值和束腰参量分别与晶体匹配的情况下,一束高斯光束能演化为稳定的屏蔽空间明孤子,而在不匹配时,一束高斯光束在传播过程中则呈现周期性的压缩或膨胀现象。同时也发现,在作用距离范围内,两束同相位高斯光束相互吸引,并伴随着融合现象,两束反相位高斯光束相互排斥,且排斥作用随着光束初始间距的减小而增加。

To investigate evolution of a Gauss beam and interaction of two Gauss beams in biased centerosymmetric photorefractive materials by applied electric filed, the beam propagation equation is solved numerically with a Gauss beam taken as the input wave. The result shows that a Gauss beam can evolve into steady-state screening bright soliton when the applied electric filed, intensity peak value and beam waist parameters match with the centrosymmetric photorefractive crystal respectively, or it will experience cycles of compression and expansion. It is also found that two same-phase beam attract each other and beams fusions occur at a certain interaction length. While in the case of anti-phase, the two beams repel each other with a force increasing monotonously with the decrease of initial separation.