At recent year , with the development of cpa and other amplification technology , laser intensity achieved great increase and laser power can be high to petawatt now , this ultrashort pulse lasers offer scientists a route to investigate laser - matter interaction in an absolute new regime 近年来，随着cpa (脉冲啁啾放大)等技术的发展，激光的功率有了很大的提高，超短脉冲激光器及超短脉冲激光与物质相互作用的研究，已发展成为当今世界最热门最前沿的领域。
Krf excimer is the best medium in uv ultrashort pulse amplification for its small saturation energy and high contrast ratio accessible . this work concentrated on uv ultrashort pulse amplification by discharge pumped and e - beam pumped krf amplifier , and build a high power krf laser system in the feature 一方面由于它的气体性质和饱和能量小，在超短脉冲放大过程中的非线性效应小，可以不采用cpa路线而直接将超短脉冲激光放大到10 ~ ( 19 ) w cm ~ 2甚至更高。
The propagation of ultrashort laser pulse in air is analyzed with mechanics analogy by considering kerr effects and free electron defocusing . the equation describing the evolution of the laser spot is derived . it is shown that long distance focusing requires large initial beam and the propagation distance is very sensitive to the initial divergence angle of the laser beam 考虑多光子电离效应和光学kerr效应，首次利用力学类比的方法研究了超短脉冲激光在电离气体中的传输，详细分析了传输距离与激光初始光斑、初始发散角以及激光功率的关系，提出了实现长距离传输的条件。
Abstract : the newest advances in ultrashort pulse laser technology are briefly reviewed , and the several most important applications of ultrashort pulse laser , such as ultra - high speed optical communication , storage of great capacity information , study of photosynthesis and chemical interactions by means of femtosecond laser are also discussed 文摘:评述了国际上超短脉冲激光技术的最新研究进展以及超短脉冲激光在超高速光通讯、海量信息存储、光合作用研究、化学反应过程研究等领域广泛的应用状况。
Ultrashort pulse amplification , including chirped pulse amplification ( cpa ) and optical parametric chirped pulse amplification ( opcpa ) , has been becoming one of the hot researches in the field of ultrashort pulse laser technology because ultrashort and ultrahigh intensity pulse laser has important applications in high field physics , such as x - ray laser , icf , laboratory astrophysics , laser particle accelerator , and so on 由于超短超强脉冲激光在x射线激光、惯性约束核聚变、实验天体物理、激光粒子加速器等强场物理研究领域内的重要应用，超短脉冲激光放大技术目前已成为超短脉冲激光技术研究的热点之一。它包括啁啾脉冲放大( cpa )和光参量啁啾脉冲放大( opcpa )两大类。
The wakefield excited by an ultrashort and ultrahigh laser pulse propagating through tenuous plasma can accelerate electrons to extreme high energy . this can be used as a mechanism to design minitype electron accelerator . this thesis is devoted to studying those issues relevant to the wakefield accelerator , namely the laser wakefield accelerator ( lwfa ) , laser wakefield accelerator driven by multiple pulses ( mp - lwfa ) , plasma beat wave accel - erator ( pbwa ) and self - modulated laser wakefield accelerator ( sm - lwfa ) 本文的目的是：利用粒子模拟方法，研究和比较激光尾流场加速电子的四种主要方案：短脉冲激光尾流场加速( lwfa ) 、多脉冲激光尾流场加速( mp - lwfa ) 、拍频束尾流场加速( pbwa ) 、自调制激光尾流场加速( sm - lwfa ) 。
On the design of the system , the thickness measure system of mems chip is built based on lbu and pump - probe technology . on the analysis of data , the reflectivity curve is analyzed using the law of reflectivity change induced by ultrasound , and the thickness is calculated using the system designed by the article , to aluminum film the size of about 20nm can be measured , when the film be measured is single layer , the relative error of the system is less than 2 % , when the film be measured is double layer , the relative error of the system is less than 10 % 在基础理论方面研究了激光(特别是超短脉冲激光)超声的激励机理，探讨了激光调制技术以提高系统信噪比，阐述了泵束探针束技术及相关实验设置；在系统设计上，以激光超声为基本原理，以泵束探针束技术为系统设计方案完成了mems基片厚度测量系统的设计；在数据分析方法上，利用声致光反射率变化的一般规律对测得的光反射率曲线进行分析，确定超声回波在薄膜两界面间来回传播的时间，以计算薄膜的厚度。
We have designed a set of ultraviolet probe and holographic interferometer system on " xg - ? " laser facility , where probe wavelength can be short as 0 . 308nm . igoring effect of magnetic field , electron density can be measuremented exactly . in this paper , holographic interferometry is interpreted in detail and and the experimental results are presented and analysed 我们在“星光”装置上设计了一套紫外超短脉冲激光探针及其全息干涉系统，该系统探针光波长可以短到0 . 308nm ，在这样的情况下忽略磁场效应可以比较精确地测量等离子体冕区( 0 . 1n _ o )电子密度。
In this paper , the experimental part is the sum - up of theoretical and experimental studies on a 20tw ti : sappire femtoscecond high - intensity laser system while author worked in the research center of laser fusion of caep , which includes oscillator , regenerative amplifier , multi - pass amplifier , stretcher , compressor and synchronization system 本文实验研究是指作者在激光聚变中心参与的20tw全钛宝石飞秒超短脉冲激光装置的工程建设工作的理论与实验研究总结，对此系统的振荡器、再生放大器、多程放大器、展宽器与压缩器及同步系统进行了较为系统的分析。
