Remote lasing in air by recombination and electron impact excitation of molecular nitrogen

被引：49

作者：

Penano, Joseph ^{[1
]}

Sprangle, Phillip ^{[1
]}

Hafizi, Bahman ^{[2
]}

Gordon, Daniel ^{[1
]}

Fernsler, Richard ^{[1
]}

Scully, Marian ^{[3
,4
,5
]}

机构：

[1] USN, Div Plasma Phys, Res Lab, Washington, DC 20375 USA

[2] Icarus Res Inc, Bethesd, MD 20824 USA

[3] Texas A&M Univ, Dept Phys & Elect Engn, College Stn, TX 77843 USA

[4] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[5] Princeton Univ, Dept Aerosp & Mech Engn, Princeton, NJ 08544 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 03期

关键词：

TEMPERATURE-DEPENDENCE; LASER; FLUORESCENCE; FILAMENTS; HELIUM;

D O I：

10.1063/1.3681282

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We analyze and simulate the physical mechanisms for a remote atmospheric lasing configuration which utilizes a combination of an ultrashort pulse laser to form a plasma filament of seed electrons, and a heater beam to heat the seed electrons. Nitrogen molecules are excited by electron impact and recombination processes to induce lasing in the ultraviolet. Recombination excitation, thermal excitation, gain, and saturation are analyzed and simulated. The lasing gain is sufficiently high to reach saturation within the length of the plasma filament. A remotely generated ultraviolet source may have applications for standoff detection of biological and chemical agents. (C) 2012 American Institute of Physics. [doi:10.1063/1.3681282]

引用

页数：8

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