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Modulation of ionization on laser frequency in ultra-short pulse intense laser-gas-target
作者姓名:胡强林  刘世炳
作者单位:Institute of Laser Engineering, Beijing University of Technology,Beijing 100022, China;Institute of Laser Engineering, Beijing University of Technology,Beijing 100022, China
基金项目:Project supported by the National Science Foundation of China (Grant Nos 10574010 and 10276002) and by Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) of China (Grant No 20050005016).
摘    要:Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting with a gas target. The relationship between the frequency modulation and the ionization rate, the plasmas frequency variation, and the polarization of atoms (ions) is analysed. The numerical results indicate that, at high frequency, the polarization of atoms (ions) plays a more important role than plasma frequency variation in modulating the laser frequency, and the laser frequency variation is different at different positions of the laser pulse.

关 键 词:强激光脉冲  隧道效应电离  部分分离等离子体  激光技术
收稿时间:2005-11-16
修稿时间:6/9/2006 12:00:00 AM

Modulation of ionization on laser frequency in ultra-short pulse intense laser--gas-target
Hu Qiang-Lin and Liu Shi-Bing.Modulation of ionization on laser frequency in ultra-short pulse intense laser-gas-target[J].Chinese Physics B,2006,15(10):2357-2362.
Authors:Hu Qiang-Lin and Liu Shi-Bing
Institution:Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, China
Abstract:Based on the dispersion relation of intense laser pulse propagating in gradually ionized plasma, this paper discusses the frequency modulation induced by ionization of an ultra-short intense laser pulse interacting with a gas target. The relationship between the frequency modulation and the ionization rate, the plasmas frequency variation, and the polarization of atoms (ions) is analysed. The numerical results indicate that, at high frequency, the polarization of atoms (ions) plays a more important role than plasma frequency variation in modulating the laser frequency, and the laser frequency variation is different at different positions of the laser pulse.
Keywords:intense laser pulse  tunnelling ionization  partially stripped plasma
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