A simple method to significantly increase filaments' length and ionization density

被引：35

作者：

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

Kosareva, O. ^{[3
]}

Panov, N. ^{[3
]}

Begin, M. ^{[1
,2
]}

Lessard, F. ^{[1
,2
]}

Marceau, C. ^{[1
,2
]}

Kamali, Y. ^{[1
,2
]}

Roy, G. ^{[4
]}

Kandidov, V. P. ^{[3
]}

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] Moscow MV Lomonosov State Univ, Dept Phys, Ctr Int Laser, Moscow 119991, Russia

[4] Def Res & Dev Ctr, Sensing Air & Surface & Optron Sect, Valcartier, PQ G3J 1X5, Canada

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2009年 / 94卷 / 02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：

FEMTOSECOND LASER-PULSES; MULTIPLE FILAMENTATION; TRANSPARENT MEDIA; AIR; POWER; LIGHT; PROPAGATION; GENERATION; INTENSITY; PHYSICS;

D O I：

10.1007/s00340-008-3270-5

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A simple method to produce longer filaments with higher ionization density in air by controlling the diameter of an aperture in the laser beam path is studied via an analysis of the backscattered N(2) fluorescence collected by LIDAR. Significant increase in the fluorescence signal (approximately by a factor of five depending on the conditions) and an increased filament length was observed at an optimum diameter. 3D + time stochastic numerical simulations have shown that the optimum aperture size corresponds to the case of multiple filament 'squeezing' around the propagation axis forming the regularized elongated structure with higher overall amount of plasma. The optimum range of aperture sizes is the same for the initial transverse perturbation scale variation at least within a factor of three.

引用

页码：249 / 257

页数：9

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