高斯光束小尺度自聚焦的临界功率

邓剑钦; 王兴龙; 刘侠; 肖青

doi:doi:10.3788/lop54.011901

激光与光电子学进展, 2017, 54 (1): 011901, 网络出版: 2017-01-17

高斯光束小尺度自聚焦的临界功率下载： 663次

Critical Power for Small-Scale Self-Focusing of Gaussian Beam

论文大纲

邓剑钦 ^1,2,*王兴龙 ²刘侠 ²肖青 ^1,2

作者单位

¹ 天津大学精密仪器与光电子工程学院激光与光电子研究所, 天津 300072

² 珠海光库科技股份有限公司, 广东珠海 519000

非线性光学自聚焦小尺度自聚焦高斯光束临界功率 nonlinear optics self-focusing small-scale self-focusing Gaussian beam critical power

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摘要

通过理论分析和数值模拟研究了高斯光束发生小尺度自聚焦(SSSF)的临界功率。发现高斯光束小尺度自聚焦的临界功率与初始调制幅度有关。初始调制幅度越大, 高斯光束分裂成丝所需的功率越小; 初始调制幅度越小则要求功率越大。当高斯光束输入功率低于高斯光束小尺度自聚焦临界功率, 但高于整体自聚焦临界功率时, 在非线性介质中传输时将以全光束塌陷的形态聚焦为一点; 当高斯光束的初始输入功率高于高斯光束小尺度自聚焦临界功率时, 在非线性介质中传输的高斯光束将分裂形成多根高强度的细丝。在高斯光束非线性传输过程中, 整体自聚焦和小尺度自聚焦效应之间存在相互竞争, 竞争的结果由高斯光束的初始参数决定。

Abstract

Critical power for small-scale self-focusing (SSSF) of Gaussian beam is studied by both theoretical analysis and numerical simulation. It is found that the initial modulation amplitude affects the critical power for SSSF of Gaussian beam. Generally, critical power of Gaussian beam deviding into filaments decreases with the increase of initial modulation amplitude, and it increases with the decrease of initial modulation amplitude. When the input power of Gaussian beam is higher than the critical power of whole beam self-focusing but lower than the critical power of SSSF, the Gaussian beam collapses into a single spot as the laser beam propagates in nonlinear media. When the initial input power of Gaussian beam is higher than the critical power of SSSF, the Gaussian beam divides into many high strength filaments as the laser beam propagates in nonlinear media. As for the nonlinear propagation process of Gaussian beam, there is a competition between the whole beam self-focusing and SSSF, and the result of the competition is determined by the initial parameters of Gaussian beam.

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邓剑钦, 王兴龙, 刘侠, 肖青. 高斯光束小尺度自聚焦的临界功率[J]. 激光与光电子学进展, 2017, 54(1): 011901. Deng Jianqin, Wang Xinglong, Liu Xia, Xiao Qing. Critical Power for Small-Scale Self-Focusing of Gaussian Beam[J]. Laser & Optoelectronics Progress, 2017, 54(1): 011901.

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