强激光超高斯光束形成的自聚焦环的分裂与抑制  

Breakup and Suppression of Self-Focusing Rings Originated From high Intensity Super-Gaussian Beams

作　　者：唐永林[1] 张小民[2] 景峰[2] 陈建国[1] 李大义[1] 

机构地区：[1]四川大学光电系,成都6100642 [2]中国工程物理研究院核物理与化学研究所高温高密度等离子体物理国防科技重点实验室,绵阳621900

出　　处：《光学学报》2001年第4期390-393,共4页Acta Optica Sinica

摘　　要：通过数值求解非线性近轴波方程 ,详细描述了在钕玻璃介质中传输的强激光圆对称超高斯光束形成的自聚焦环 ,并展示了初始光束受到扰动引起环分裂的现象。对于峰值光强一定的光束 ,合理地选择其阶数和宽度 ,可以降低自聚焦成环效应 ,从而降低因自聚焦环分裂在光束边缘出现的细光束对介质造成的成丝破坏。The self-focusing ring originated from a rotation symmetric super-Gaussian beam (RSSGB) incident on the Nd:glass medium is described, with the aid of the numerical solution to the nonlinear paraxial wave equation. For a RSSGB with initial undulations, the self-focusing ring may split after traveling certain distance inside the nonlinear medium, resulting in some high intensity filaments near the verge of the beam. For a RSSGB with a certain peak power, one can select the width and rank of the beam to suppress the formation of the self-focusing ring, so that the filaments due to the breakup of self-focusing rings may be eliminated finally.

关 键 词：自聚焦环 克尔介质 超高斯光束 成丝破坏 强激光 光束分裂 非线性效应 惯性约束聚变驱动器 

分 类 号：TL632[核科学技术—核技术及应用] O437.5[机械工程—光学工程]