Signature of superradiance from a nitrogen-gas plasma channel produced by strong-field ionization

被引：78

作者：

Li, Guihua ^{[1
,2
,3
]}

Jing, Chenrui ^{[1
,3
]}

Zeng, Bin ^{[1
]}

Xie, Hongqiang ^{[1
,3
]}

Yao, Jinping ^{[1
]}

Chu, Wei ^{[1
]}

Ni, Jielei ^{[1
]}

Zhang, Haisu ^{[1
,3
]}

Xu, Huailiang ^{[2
]}

Cheng, Ya ^{[1
]}

Xu, Zhizhan ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[2] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

PHYSICAL REVIEW A | 2014年 / 89卷 / 03期

基金：

中国国家自然科学基金;

关键词：

FEMTOSECOND LASER-PULSES; SUPERFLUORESCENCE; GENERATION; MOLECULES; EMISSIONS; AIR; SPECTROSCOPY; DYNAMICS; SUPER; BOND;

D O I：

10.1103/PhysRevA.89.033833

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Recently, Yao et al. demonstrated the creation of coherent emissions in nitrogen gas with two-color (800 nm + 400 nm) ultrafast laser pulses [J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, New J. Phys. 15, 023046 (2013)]. Based on this two-color scheme, here we report on systematic investigation of temporal characteristics of the radiation emitted at 391 nm [N-2(+): B-2 Sigma(+)(u) (v = 0) -X-2 Sigma(+)(g) (v = 0)] by experimentally examining its temporal profiles with the increase of the plasma channel induced by the intense 800-nm femtosecond laser pulses at a nitrogen-gas pressure of similar to 25 mbar. We reveal unexpected temporal profiles of the coherent emissions, which show significant superradiance signatures owing to the cooperation of an ensemble of excited N-2(+) molecules that are coherently radiating in phase. Our findings shed more light on the mechanisms behind the coherent laserlike emissions induced by strong-field ionization of molecules.

引用

页数：5

共 38 条

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