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Intensity-independent molecular rotational decoherence lifetimes measured with mean wavelength shifts of femtosecond pulses

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Abstract

We report on an experimental investigation on the dynamic decoherence process of molecular rotational wavepackets during femtosecond laser filamentation based on time-dependent mean wavelength shifts of a weak probe pulse. Details of periodic revival structures of transient alignment can be readily obtained from the measured shifted spectra due to the periodic modulation of the molecular refractive index. Using the method, we measured decoherence lifetimes of molecular rotational wavepackets in N2 and O2 under different experimental conditions. Our results indicate that decoherence lifetimes of molecular rotational wavepackets are primarily determined by the relative population of rotational states in the wave packet and intermolecular collisions, rather than the focusing intensity.

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DOI:10.3788/col201816.120201

所属栏目:Atomic and molecular physics

基金项目:This work was supported by the National Basic Research Program of China (No. 2014CB921303), the National Natural Science Foundation of China (Nos. 61575211, 11674340, 61405220, 11404357, 61605227, 61705034, and 11704066), the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB16000000), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (No. QYZDJ-SSW-SLH010), the Shanghai Yangfan Program (No. 16YF1412700), the Natural Science Foundation of Jiangxi Province (No. 20171BAB211007), the Science and Technology Project of Jiangxi Provincial Education Department (Nos. GJJ160587 and GJJ160576), and the Shanghai Rising-Star Program (No. 17QA1404600).

收稿日期:2018-09-03

录用日期:2018-11-01

网络出版日期:2018-11-29

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Hongqiang Xie:School of Science, East China University of Technology, Nanchang 330013, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Guihua Li:School of Science, East China Jiaotong University, Nanchang 330013, China
Jinping Yao:State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Wei Chu:State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Zhiming Chen:School of Science, East China University of Technology, Nanchang 330013, China
Ya Cheng:State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaCollaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

联系人作者:Ya Cheng(ya.cheng@siom.ac.cn)

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引用该论文

Hongqiang Xie, Guihua Li, Jinping Yao, Wei Chu, Zhiming Chen, Ya Cheng, "Intensity-independent molecular rotational decoherence lifetimes measured with mean wavelength shifts of femtosecond pulses," Chinese Optics Letters 16(12), 120201 (2018)

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