Filament-induced amplified spontaneous emission in air-hydrocarbons gas mixture

被引：22

作者：

Hosseini, Sima ^{[1
]}

Azarm, Ali

Daigle, Jean-Francois

Kamali, Yousef

Chin, See Leang

机构：

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

来源：

OPTICS COMMUNICATIONS | 2014年 / 316卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Filament; Amplified spontaneous emission (ASE); Fluorescence; FEMTOSECOND LASER-PULSES; INTENSITY; SPECTROSCOPY; DISCHARGES; PHYSICS; LIGHT; POWER;

D O I：

10.1016/j.optcom.2013.11.016

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Filament-induced amplified spontaneous emission, ASE, in air-hydrocarbons (similar to 2%) gas mixture, CH4, C2H2, and C2H4, was investigated by detecting fluorescence emitted from CH fragments prepared in the electronically excited A(2)Delta state in the filament. The fluorescence signal recorded from the side direction of the filament was linearly proportional to the length of the filament, while the fluorescence signal emitted in the backward direction of the laser propagation increased nonlinearly with the filament length. This difference showing that the filament acted as a gain medium in which the spontaneous emission from CH was amplified (ASE). This process realized by a small amount of hydrocarbon molecular species in air can be applied to remote sensing of pollutants in air. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：61 / 66

页数：6

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