Strong-Field-Induced N2+ Air Lasing in Nitrogen Glow Discharge Plasma  

作　　者：Nana Dong Yan Zhou Shanbiao Pang Xiaodong Huang Ke Liu Lunhua Deng Huailiang Xu 董娜娜;周燕;庞山彪;黄晓东;刘珂;邓伦华;徐淮良(State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China;State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China;Chongqing Institute of East China Normal University,Chongqing 401120,China;CAS Center for Excellence in Ultra-intense Laser Science,Shanghai 201800,China)

机构地区：[1]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China [2]State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China [3]Chongqing Institute of East China Normal University,Chongqing 401120,China [4]CAS Center for Excellence in Ultra-intense Laser Science,Shanghai 201800,China

出　　处：《Chinese Physics Letters》2021年第4期46-50,共5页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.61625501 and 62027822);the Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM)。

摘　　要：We investigate N_(2)^(+) air lasing at 391 nm,induced by strong laser fields in a nitrogen glow discharge plasma.We generate forward N_(2)^(+) air lasing on the B^(2)Σ_(u)^(+)(v’=0)-X^(2)Σ_(g)^(+)(v"=0) transition at 391 nm by irradiating an intense 35-fs,800-nm laser in a pure nitrogen gas,finding that the 391-nm lasing quenches when the nitrogen gas is electrically discharged.In contrast,the 391-nm fluorescence measured from the side of the laser beam is strongly enhanced,demonstrating that this discharge promotes the population in the B^(2)Σ_(u)^(+)(v’=0) state.By comparing the lasing and fluorescence spectra of the nitrogen gas obtained in the discharged and laser-induced plasma,we show that the quenching of N_(2)^(+) lasing is caused by the efficient suppression of population inversion between the B^(2)Σ_(u)^(+) and X^(2)Σ_(g)^(+) states of N_(2)^(+),in which a much higher population occurs in the X^(2)Σ_(g)^(+) state in the discharge plasma.Our results clarify the important role of population inversion in generating N_(2)^(+) air lasing,and also indicate the potential for the enhancement of N_(2)^(+) lasing via further manipulation of the population in the X^(2)Σ_(g)^(+) state in the discharged medium.

关 键 词：LASING STRONG GENERATING 

分 类 号：O461.21[理学—电子物理学]