光学学报, 2010, 30 (9): 2639, 网络出版: 2014-05-15   

数值模拟不同偏振飞秒激光在石英介质中的传输过程和脉宽自压缩

Numerical Simulation of the Polarized Femtosecond Laser Propagation in Silica and SelfCompression
作者单位
中央民族大学理学院, 北京,100081
摘要
基于超快光脉冲的非线性传输模型,数值模拟了不同偏振态下的飞秒光脉冲在石英介质中的传输过程,分析了不同偏振度和数值孔径对光脉冲传输特性和脉冲压缩的影响,获得光脉冲出现再聚焦效应的临界椭圆度和临界数值孔径。研究结果表明在松聚焦条件下,自聚焦效应造成了不同偏振光脉冲在传输中表现出明显不同的光强分布和等离子体细丝结构。在光脉冲的时域演化过程中,圆偏振光与线偏振光相比仅出现自压缩,而未出现脉冲分裂。在紧聚焦条件下,由于透镜的线性聚焦相比自聚焦占据主导地位,因此不同偏振光传输特性和脉冲压缩规律趋于一致,且未出现明显自压缩现象。
Abstract
Based on the nonlinear propagation model of ultrafast laser pulses, the polarization dynamics of femtosecond laser pulse in silica is numerically simulated. The degree of polarization and the numerical aperture have effect on the ultrashort laser transmission and the pulse compression. Both the critical degree of the laser polarization and the critical numerical aperture are obtained when the refocusing of laser beams occurs. The results show that by the loose focusing, ultrafast pulses with the linear, elliptic and circular polarizations demonstrate various intensity distribution and plasma filaments structure due to the selffocusing effect. In the temporal domain, the circularly polarized laser, compared with the linearly polarized laser, only shows the selfcompression without the pulse splitting. However, by the tight focusing, three polarized lasers tend to the similar propagation property without the obvious pulse compression.

苏玉成, 陈笑, 钟悦, 邹斌, 王义全. 数值模拟不同偏振飞秒激光在石英介质中的传输过程和脉宽自压缩[J]. 光学学报, 2010, 30(9): 2639. Su Yucheng, Chen Xiao, Zhong Yue, Zou Bin, Wang Yiquan. Numerical Simulation of the Polarized Femtosecond Laser Propagation in Silica and SelfCompression[J]. Acta Optica Sinica, 2010, 30(9): 2639.

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