%0 Journal Article
%T Variational method in the study of intense laser beams propagation in plasma channels<br>强激光束在等离子体通道中传输的变分法研究
%A Liu Ming-Wei
%A Guo Hong
%A Deng Dong-Mei
%A Zhang Yu
%A Chen Xu-Zong
%A <br>刘明伟
%A 郭弘
%A 邓冬梅
%A 张宇
%A 陈徐宗
%J 物理学报
%D 2004
%I 
%X In an underdense plasma, the laser wave equation is given with higher-order-relativistic (HOR) effect. A variational methed is used to study HOR effect for intense laser beam propagation in plasma channel including diffraction, pre-formed plasma channel guiding and lower order relativistic effects. In the paraxial approximation, a potential well also exists for laser spot size. HOR effect decreases the amplitude of laser spot size oscillation, whereas accelerates its rate. Furthermore, it prevents the singularity of infinite intesity of laser beam when laser power is greater than (or equal to) the relativistic critical power. The condition of balance-solution of the beam spot size is also given.
%K variational method
%K plasma channel
%K higher-order-relativistic<br>等离子体通道
%K 变分法
%K 高阶相对论
%K 激光束
%K 真空衍射
%K 傍轴近似
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=81CC576A76E728AA&yid=D0E58B75BFD8E51C&vid=8E6AB9C3EBAAE921&iid=94C357A881DFC066&sid=8EA44A8F6C7F424F&eid=AFD02B86BFB3C7FC&journal_id=1000-3290&journal_name=物理学报&referenced_num=7&reference_num=16