Spectroscopic analysis of femtosecond laser plasma filament in air

被引：60

作者：

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

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

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

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

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

Chateauneuf, M. ^{[4
]}

Dubois, J. ^{[4
]}

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

机构：

[1] Univ Laval, Ctr Opt Photon & Laser, 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, Quebec City, PQ G3J 1X5, Canada

来源：

OPTICS COMMUNICATIONS | 2008年 / 281卷 / 05期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

D O I：

10.1016/j.optcom.2007.10.100

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report a spectroscopic analysis of a filament generated by a femtosecond laser pulse in air. In the filament spectra, the characteristic Stark broadened atomic oxygen triplet centered at 777.4 nm has been observed. The measured electron impact Stark broadening parameter of the triplet is larger than the theoretical value by Griem [H.R. Griem, Plasma Spectroscopy, McGraw Hill, New York, 1964] by a factor 6.7. Using the experimental value 0.0166 nm, the plasma densities derived from Stark broadening agree well with those most recently obtained from Theberge et al.'s measurement of the nitrogen fluorescence calibrated by longitudinal diffraction [F. Theberge, W. Liu, P.T. Simard, A. Becker, S. L. Chin, Phys. Rev. E 74 (2006) 036406]. However, the Stark broadening approach is much simpler and can be used to non-invasively measure the filament plasma density distribution in air under different propagation conditions. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：1268 / 1274

页数：7

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