TY - JOUR
T1 - Signature of superradiance from a nitrogen-gas plasma channel produced by strong-field ionization
AU - Li, Guihua
AU - Jing, Chenrui
AU - Zeng, Bin
AU - Xie, Hongqiang
AU - Yao, Jinping
AU - Chu, Wei
AU - Ni, Jielei
AU - Zhang, Haisu
AU - Xu, Huailiang
AU - Cheng, Ya
AU - Xu, Zhizhan
PY - 2014/3/25
Y1 - 2014/3/25
N2 - 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)NJOPFM1367- 263010.1088/1367-2630/15/2/023046]. Based on this two-color scheme, here we report on systematic investigation of temporal characteristics of the radiation emitted at 391 nm [N2+: B2Σu+ν=0-X2Σg+ν=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 ∼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 N2+ 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.
AB - 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)NJOPFM1367- 263010.1088/1367-2630/15/2/023046]. Based on this two-color scheme, here we report on systematic investigation of temporal characteristics of the radiation emitted at 391 nm [N2+: B2Σu+ν=0-X2Σg+ν=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 ∼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 N2+ 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.
UR - https://www.scopus.com/pages/publications/84898078322
U2 - 10.1103/PhysRevA.89.033833
DO - 10.1103/PhysRevA.89.033833
M3 - 文章
AN - SCOPUS:84898078322
SN - 1050-2947
VL - 89
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 033833
ER -