超快激光脉冲在随机表面上的传播特性研究  

Study on the Properties of the Femtosecond Laser Pulses Propagating on the Random Self-affine Fractal Surface

作　　者：任晓荣[1] 李建[1] 

机构地区：[1]山东轻工业学院实验与工程训练管理中心,山东济南250353

出　　处：《山东轻工业学院学报（自然科学版）》2012年第4期34-39,共6页Journal of Shandong Polytechnic University

基　　金：国家自然科学基金(69978012)

摘　　要：本文采用格林函数法和边界条件,计算模拟了飞秒激光脉冲在自仿射随机表面上的传播过程。计算结果表明,飞秒脉冲在界面上是沿界面向两边传播的,衍射场的光强分布和散斑颗粒都随着时间的变化而变化。脉冲宽度不同的入射激光脉冲照射到同一个随机表面上时,散斑场的光强、光强的对比度都随着脉冲宽度的变化而变化,但散斑光强分布的几乎不变。In this paper,the propagating process of the femtosecond laser pulses on the random self-affine fractal surface was simulated and calculated by using the method for Green＇s function and boundary conditions.The calculation results show that the femtosecond laser pulses propagate along the both sides of the aperture along the medium interface,and during the propagating process,the distributing of the intensity of the diffraction light fields and the average sizes of speckle granules are both varied with time.When femtosecond laser pulses with different width of laser pulse irradiate a same random surface,the intensity of the speckle field and the speckle contrast are different with the width of laser pulse,while the distribution of the speckle field intensity almost doesn＇t change.

关 键 词：飞秒脉冲 格林函数 自仿射分形随机表面 

分 类 号：O438[机械工程—光学工程]