双环斑激光束在克尔介质中的自聚焦和光斑分裂效应(英文)  

Experimental and Theoretical Study of Self-focusing and Spot-splitting of the Double-circle Spot Laser Beam in Kerr-medium

作　　者：沈常宇[1] 尹宝银[2] 苗润才[2] 陈飞[1] 

机构地区：[1]中国计量学院 [2]陕西师范大学,陕西西安710062

出　　处：《量子光学学报》2007年第1期35-38,共4页Journal of Quantum Optics

基　　金：浙江省科技厅项目(2004c31100)~~

摘　　要：实验上发现了双环斑激光束在克尔介质中的光斑分裂效应。理论上,通过数值求解非线性薛定谔方程,发现当输入光斑功率超过100 kW/cm2时,产生光斑分裂和自聚焦效应,该阈值明显小于单环斑激光的自聚焦和光斑分裂阈值。我们认为是双环之间的耦合效应导致了这种结果,并给出了具体分析。The self-focusing and spot-splitting effects of the double-circle spot laser beam in Kerr-medium are observed in the expenment. Theoretically, with solving nonlinear Schroedinger equation numerically, the effects of self-focusing and spot- splitting are generated when the input laser＇ s power is 100 kW/cm^2 , which is much lower than the single-circle spot laser beam＇ s threshold of serf-focusing and spot-splitting. Through numerically analysis, it finds that the decrease of threshold mainly results from the coupling effect between the two circles, which also leads to the fact that the two circles＇ focal length and focal intensity are different to each other.

关 键 词：双环斑激光束 克尔介质 自聚焦 光斑分裂 

分 类 号：O431[机械工程—光学工程]