无序激光器激光出射的空间分布

J4 ›› 2009, Vol. 26 ›› Issue (5): 543-547.

无序激光器激光出射的空间分布

付方正李明

南昌大学物理系, 江西南昌 330031

出版日期:2009-09-28 发布日期:2009-08-27
通讯作者: 付方正，男，1956生，汉族，南昌人，南昌大学物理系教授，博士，主要从事激光方面的研究工作。 E-mail:ffz050919@sohu.com
基金资助:
国家自然科学基金(10464002)

Spatial distribution of output laser in random laser

FU Fang-Zheng, LI Ming

Department of Physics, Nanchang University, Nanchang 330031

Published:2009-09-28 Online:2009-08-27

摘要/Abstract

摘要：

讨论一种散射，导出相应的分布函数。分析增益区几何形状，运用蒙特卡罗法模拟光子在无序介质中的随机行走，得到激光出射的空间分布。结果表明：在界面法线方向，激光强度最强，随角度增大强度逐渐减弱，并且光强关于法线旋转对称。激光出射的空间分布与无序介质中光子平均自由程有关，据此可通过测量激光出射的空间分布来反推光子平均自由程。出射的激光光子绝大多数（一般95%以上）都是在离界面3个平均自由程距离内散射出来的。

关键词: 激光物理, 空间分布, 蒙特卡罗, 散射

Abstract:

A kind of scattering is discussed and the corresponding distribution function is deduced . We analyze the geometry of the gain area, the spatial distribution of output laser is got by simulating the movement of stochastic photon in random medium by the use of the Monte Carlo method. The results show that ：the laser intensity is the strongest in the normal direction. It weakens gradually with the angle increasing .The light intensity is symmetrical on the normal. The spatial distribution of output laser is connected with the mean free path of photons in random medium .According to these we can get the mean free path of the photons by measuring the spatial distribution of output laser. The vast majority of output laser photons (generally above 95%) scatter out within the distance of three mean free path from the interface.

Key words: laser physics, spatial distribution, Monte Carlo, scattering

付方正李明. 无序激光器激光出射的空间分布[J]. J4, 2009, 26(5): 543-547.

FU Fang-Zheng, LI Ming. Spatial distribution of output laser in random laser[J]. J4, 2009, 26(5): 543-547.

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