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激光脉宽和偏振效应对飞秒光丝诱导燃烧中间产物荧光光谱的影响

Effects of Pulse Duration and Polarization on Femtosecond Filament-Induced

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摘要

聚焦激光脉宽和偏振对飞秒光丝诱导燃烧场中间产物荧光光谱的影响,通过改变激光脉宽、偏振状态,观测了燃烧中间产物如OH、CH、CN、C2分子和C原子的荧光光谱变化。结果发现:随着激光脉宽和偏振椭圆率增大,各组分荧光信号强度减小,这是因为光丝内激光钳制强度及等离子的密度与激光脉宽、偏振密切相关,进而导致多光子激发燃烧中间产物的信号随之变化。Fluorescence of Combustion Intermediates

Abstract

The effects of laser pulse duration and polarization on the femtosecond filament-induced fluorescence of combustion intermediates were studied herein. The variations in the fluorescence spectra of combustion intermediates, such as OH, CH, CN, C2, and C, were observed by varying laser pulse duration and polarization. The results show that the fluorescence intensities of all the observed combustion intermediates decrease with the increase of laser pulse duration and polarization ellipticity. This behavior is explained by the fact the clamped intensities and plasma densities inside the filament core are strongly dependent on laser pulse duration and polarization, leading to the changes in the multiphoton-excited signals of combustion intermediates.

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中图分类号:TN249

DOI:10.3788/cjl201946.0508024

所属栏目:“超快激光非线性光学”专题

基金项目:国家自然科学基金(61427816,61625501)

收稿日期:2019-01-19

修改稿日期:2019-03-11

网络出版日期:2019-03-25

作者单位    点击查看

侯梦瑶:吉林大学电子科学与工程学院, 吉林 长春 130012
王思琪:吉林大学电子科学与工程学院, 吉林 长春 130012
姚丹雯:吉林大学电子科学与工程学院, 吉林 长春 130012
付尧:吉林大学电子科学与工程学院, 吉林 长春 130012
臧宏伟:吉林大学电子科学与工程学院, 吉林 长春 130012
李贺龙:吉林大学电子科学与工程学院, 吉林 长春 130012吉林大学原子与分子研究所, 吉林 长春 130012
徐淮良:吉林大学电子科学与工程学院, 吉林 长春 130012

联系人作者:徐淮良(huailiang@jlu.edu.cn)

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引用该论文

Hou Mengyao,Wang Siqi,Yao Danwen,Fu Yao,Zang Hongwei,Li Helong,Xu Huailiang. Effects of Pulse Duration and Polarization on Femtosecond Filament-Induced[J]. Chinese Journal of Lasers, 2019, 46(5): 0508024

侯梦瑶,王思琪,姚丹雯,付尧,臧宏伟,李贺龙,徐淮良. 激光脉宽和偏振效应对飞秒光丝诱导燃烧中间产物荧光光谱的影响[J]. 中国激光, 2019, 46(5): 0508024

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