Onset of nonlinear self-focusing of femtosecond laser pulses in air: Conventional vs spatiotemporal focusing

被引：7

作者：

Cheng, Ya ^{[1
]}

Xie, Hongqiang ^{[1
,2
]}

Wang, Zhaohui ^{[1
,2
]}

Li, Guihua ^{[1
]}

Zeng, Bin ^{[1
]}

He, Fei ^{[1
]}

Chu, Wei ^{[1
]}

Yao, Jinping ^{[1
]}

Qiao, Lingling ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

PHYSICAL REVIEW A | 2015年 / 92卷 / 02期

基金：

中国国家自然科学基金;

关键词：

FILAMENTATION; BREAKDOWN;

D O I：

10.1103/PhysRevA.92.023854

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report an experimental comparison of critical intensities of nonlinear self-focusing in air with conventional focusing and spatiotemporal focusing schemes. Our results show that the conventional focusing with the focal lens completely filled with the incident beam allows for a higher peak intensity near the focus against the nonlinear self-focusing than the spatiotemporal focusing scheme. This is because in the high-numerical-aperture condition, the focal spot will have a compact size, which results in a high focal intensity. Meanwhile, the Rayleigh length of the focused beam will be substantially shortened, which efficiently postpones the onset of self-focusing.

引用

页数：4

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