%0 Journal Article
%T Density modulation produced by ultrashort laser pulses and the phase reflection induced in underdense plasmas<br>激光脉冲诱导的等离子体密度调制及其产生的相位反射
%A Zhang Qiu-Ju
%A Sheng Zheng-Ming
%A Cang Yu
%A Zhang Jie
%A <br>张秋菊
%A 盛政明
%A 苍 宇
%A 张 杰
%J 物理学报
%D 2005
%I 
%X It is shown theoretically and by particle-in-cell simulations that the interfering fields of the incident and reflected laser pulses can produce deep plasma density modulations in underdense pre-plasmas. This occurs within a few tens of laser cycles if the incident laser pulse is at moderate intensities such as 10^15W/cm^2. Such density modulations can serve as a Bragg reflector, which results in phase reflection from underdense plasmas. Because the deep density modulations are just a period of half a wavelength in the plasma,the reflected wave reaches the maximum by resonance with a reflectivity up to near 100% .The phase reflection can also be observed from the plasma with a linear density profile, which can significantly reduce the laser absorption by fusion targets.
%K phase reflection
%K density modulation
%K laser plasma
%K particle-in-cell simulations<br>相位反射，
%K 密度调制，
%K 激光等离子体，
%K 粒子模拟
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=11DFC2378A805413&yid=2DD7160C83D0ACED&vid=318E4CC20AED4940&iid=9CF7A0430CBB2DFD&sid=458FC2DD16640963&eid=A2286CD3883B21D9&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=11