%0 Journal Article
%T Study of small-scale self-focusing in laser beams by high-order contrast<br>用高阶对比度研究光束的小尺度自聚焦
%A Yi Xu-Nong
%A Hu Wei
%A Luo Hai-Lu
%A Zhu Jing
%A <br>易煦农
%A 胡巍
%A 罗海陆
%A 朱静
%J 物理学报
%D 2005
%I 
%X In this paper, high_order contrast is brought forward for studying small_scale s elf_focusing phenomenon in high_power solid state laser drivers. Based on the p roperties of semi_invariant, we obtain the analytic expressions of high_order co ntrast of near field of beams. Finally, we study the propagation of plane waves w ith PSD phase noise and obtain the evolution of fill factor, modulation, contras t, third_order contrast and fourth_order contrast with B-integral value. Compa ring t he results of numerical simulation, we find that third_order contrast and fourth _order contrast are good parameters for characterizing the small_scale self_focu sing phenomenon.
%K small_scale self_focusing
%K third_order contrast
%K fourth_order contrast
%K power sp ectrum density phase noise<br>小尺度自聚焦，
%K 三阶对比度，
%K 四阶对比度，
%K 功率谱密度相位噪声
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=F3F54169F99D8AC3&yid=2DD7160C83D0ACED&vid=318E4CC20AED4940&iid=0B39A22176CE99FB&sid=762CFFBBDED11937&eid=9409F3EB075DCD5B&journal_id=1000-3290&journal_name=物理学报&referenced_num=1&reference_num=13