TY - JOUR
T1 - Strong and coherent forward emissions from molecules driven by femtosecond infrared laser pulses
AU - Xu, Huailiang
AU - Yao, Jinping
AU - Chu, Wei
AU - Zeng, Bin
AU - Ni, Jielei
AU - Li, Guihua
AU - Cheng, Ya
AU - Xu, Zhizhan
AU - Kartashov, Daniil
AU - Alisauskas, Skirmantas
AU - Pugzlys, Audrius
AU - Baltuska, Andrius
AU - Yamanouchi, Kaoru
AU - Chin, See Leang
N1 - Publisher Copyright:
© Springer International Publishing Switzerland 2014.
PY - 2014
Y1 - 2014
N2 - Strong narrow-band coherent emission lines of the B2Σ+ u –X2Σ+ g transition of N+ 2 in air and the A2Πu–X2Πg transition of CO+ 2 in CO2 gas are observed from filaments generated by intense infrared femtosecond laser pulses (1150– 2000 nm, <200 fs) in air. The coherent emission stimulated by self-generated third and/or fifth harmonics of the infrared femtosecond laser pulses is found to propagate in the forward direction along the infrared laser beam and has the same polarization direction as the third and fifth harmonics serving as the seed light. The intensity of the strong forward emissions of N+ 2 and CO+ 2, exhibiting excellent temporal and spatial coherence properties, is two orders of magnitude stronger than that of the fluorescence of molecules, and is strongly dependent on the pump laser intensity, the intensity of the seed harmonic radiation, and the filament length. The possible mechanisms responsible for the generation of the strong coherence emissions are discussed.
AB - Strong narrow-band coherent emission lines of the B2Σ+ u –X2Σ+ g transition of N+ 2 in air and the A2Πu–X2Πg transition of CO+ 2 in CO2 gas are observed from filaments generated by intense infrared femtosecond laser pulses (1150– 2000 nm, <200 fs) in air. The coherent emission stimulated by self-generated third and/or fifth harmonics of the infrared femtosecond laser pulses is found to propagate in the forward direction along the infrared laser beam and has the same polarization direction as the third and fifth harmonics serving as the seed light. The intensity of the strong forward emissions of N+ 2 and CO+ 2, exhibiting excellent temporal and spatial coherence properties, is two orders of magnitude stronger than that of the fluorescence of molecules, and is strongly dependent on the pump laser intensity, the intensity of the seed harmonic radiation, and the filament length. The possible mechanisms responsible for the generation of the strong coherence emissions are discussed.
UR - https://www.scopus.com/pages/publications/84927673393
U2 - 10.1007/978-3-319-00521-8_7
DO - 10.1007/978-3-319-00521-8_7
M3 - 文章
AN - SCOPUS:84927673393
SN - 0172-6218
VL - 106
SP - 95
EP - 109
JO - Springer Series in Chemical Physics
JF - Springer Series in Chemical Physics
ER -