提高飞秒超强激光对比度测量动态范围的一种新方法  

A new method to improve the dynamic range of contrast ratio measurement on the nanosecond scale

作　　者：李伟昌[1,2] 王兆华[1] 刘成[1] 魏志义[1] 

机构地区：[1]中国科学院物理研究所北京凝聚态物理国家实验室,北京100190 [2]国防科技大学应用物理系,长沙410073

出　　处：《物理》2011年第4期259-262,共4页Physics

基　　金：国家自然科学基金(批准号:10804128);国家高技术研究发展计划(批准号:2009AA8044031);国家重点基础研究发展计划(批准号:2007CB815104)资助项目

摘　　要：普克尔盒(Pockelscell)和格兰棱镜以一定方式组合使用时能对超强激光脉冲的主脉冲进行消光而不会削弱预脉冲的强度,利用这一特性,文章作者设计搭建了一套高动态范围的激光纳秒对比度测量系统,利用该方法将对比度在ns量程内的动态测量范围提高了3个量级,并实验测得了2.95×10-8的纳秒对比度.By combining a Pockels cell and a Glan prism in a special way for polarization applications,the main pulse of an ultrahigh intensity laser can be greatly suppressed but the amplified spontaneous emission will not be weakened.Based on this fact,we designed a new method to measure the contrast ratio of ultraintense laser pulses with a high dynamic range on the order of nanoseconds.As a result,the measurable dynamic range of the contrast ratio was increased by three orders of magnitude,and a contrast ratio of 2.95×10-8 was obtained with this new technique.

关 键 词：钛宝石激光器 对比度测量 飞秒超强激光 动态范围 

分 类 号：TN248[电子电信—物理电子学]