一种调节飞秒激光脉冲时空重合的新方法  

A novel method to adjust the spatio-temporal superposition between two femtosecond laser pulses

作　　者：史彦超[1] 刘作业[1] 赵培茜[1] 郭泽钦[1] 丁鹏基[1] 刘情操[1] 胡碧涛[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《激光技术》2013年第3期385-388,共4页Laser Technology

基　　金：国家自然科学基金资助项目(91026021)

摘　　要：为了实现调节两束飞秒激光脉冲在时间和空间区域上的精确重合,采用利用CCD成像系统调节光束在空间上的重合及利用能量计测量激光脉冲核心能量变化来调节飞秒脉冲间的时间间隔的新方法,取得了核心能量随延迟时间变化的数据,并记录了相应的等离子体荧光图像。结果表明,与传统方法相比,这种方法可以达到飞秒级的时间重合精度。这为确定激光的时空重合提供了一种简便有效的途径,且在激光光束以大角度相交时仍然可以确定最佳重合点。To achieve accurate spatio-temporal superposition between two femtosecond laser pulses, a CCD imaging system was used to adjust the spatial superposition of both the beams and an energy meter was applied to measure the core energy of the probe pulses so that the temporal separation between the pulses could be adjusted. The dependence of the core energy on the time delay and the corresponding plasma fluorescence distribution were obtained. The experimental result proves that this method can achieve a higher time accuracy （femtosecond scale） than the traditional method, even when the crossing angle between the two femtosecond laser beams is vertical.

关 键 词：激光技术 延迟时间调节 核心能量 能量计 

分 类 号：O437[机械工程—光学工程]