Critical power for self-focussing of a femtosecond laser pulse in helium

被引：23

作者：

Bernhardt, J. ^{[1
,2
]}

Simard, P. T. ^{[1
,2
]}

Liu, W. ^{[1
,2
,3
]}

Xu, H. L. ^{[1
,2
]}

Theberge, F. ^{[1
,2
,4
]}

Azarm, A. ^{[1
,2
]}

Daigle, J. F. ^{[1
,2
]}

Chin, S. L. ^{[1
,2
]}

机构：

[1] Univ Laval, COPL, Quebec City, PQ G1V 0A6, Canada

[2] Univ Laval, Dept Phys Genie Phys & Opt, Quebec City, PQ G1V 0A6, Canada

[3] Nankai Univ, Inst Modern Opt, Tianjin 300071, Peoples R China

[4] Def Res & Dev Canada Valcartier, Quebec City, PQ G3J 1X5, Canada

来源：

OPTICS COMMUNICATIONS | 2008年 / 281卷 / 08期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金; 加拿大创新基金会;

关键词：

D O I：

10.1016/j.optcom.2007.12.001

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The critical power for self-focussing of a femtosecond laser pulse in helium has been measured using the moving focus method. The experimental value is P-crit(exp)(1 atm) similar to 268 GW. Using this value, the nonlinear refractive index is inferred to be n(2)(exp)(1 atm) similar to 3.6 x 10(-21) cm(2)/W. In addition, the plots of the electron densities versus energy and pressure have also been used to determine the critical power of helium, based on the intensity clamping of the filamentation process. The value agrees well with the one by the moving focus method. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：2248 / 2251

页数：4

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