【作者】 穆参军；

【导师】 侯洵； 白晋涛；

【作者基本信息】 西北大学 ， 光学， 2002， 硕士

【摘要】 超高强度超短激光脉冲因为在x射线激光、实验天体物理、惯性约束核聚变、激光粒子加速器以及强场物理等研究领域内具有非常重要的应用价值而成为目前超短脉冲激光技术的热点研究内容之一，啁啾脉冲激光放大技术作为一种可以获得飞秒量级超强激光脉冲的有效手段而受到人们的广泛重视，世界各国均投入大量的人力、物力对其进行研究。 在攻读硕士学位期间，作者有幸参与了国家“九五”攀登计划项目“强场激光物理与超快过程研究”子项目“30fs以下TW级激光放大系统的研究”的部分工作。本论文是对所做具体工作的总结，主要内容包括： 1．研究了飞秒脉冲激光器中的群速度色散、自相位调制、克尔透镜锁模以及锁模自启动问题；分析了自锁模飞秒Ti:Sapphire激光器的色散补偿与激光谐振腔的像散补偿问题；在此基础上开展了部分实验工作，经过优化，直接获得了脉冲宽度为10fs，重复率为82MHz，输出功率达到800mW的锁模脉冲序列。 2．改进并设计了消像差光栅展宽器，经过优化获得了61552.1倍的展宽比，输出的展宽脉冲为615.52ps；在ABCD矩阵的基础上，通过引入色散项获得了可以方便分析色散系统的矩阵方程，使用该方法方便、准确地计算了消像差光栅展宽器的二阶与三阶色散量；在考虑三阶色散的情况下，修改了计算啁啾激光脉冲展宽比的公式，并精确计算了消像差光栅展宽器的展宽比，这一部分也是作者工作的重点。 3．分析并讨论了啁啾脉冲激光放大理论以及激光脉冲放大过程中出现的各种非线性效应，给出可相应的解决方法。 4．采用矩阵方程计算了光栅对压缩器的色散量；讨论了啁啾脉冲激光放大系统的色散补偿问题，并对消像差光栅展宽—压缩系统的色散补偿问题进行了评价。 5．针对飞秒激光脉冲测量技术以及脉冲选单技术开展了部分实验工作，并取得了较好的实验结果。更多还原

【Abstract】 Ultrahigh intensity and ultrashort pulse laser has been becoming one of focus research items in the field of ultrashort pulse laser technology, because it has an important application in many fields, such as X-ray laser, lab celestial bodies physics, ICF, laser particle accelerator, high-intensity field laser and so on.As chirped pulse laser amplification (CPA) is an effective method of getting femtosecond ultra-high laser pulse, it is attracting more and more attention, many countries all over the world have paid many people and money to research it.During studying for Master Degree, I am luck to participate in the item "research on the sub-30fs, terawatt level’s laser amplifier system" attributed to the work "research on the high intensity laser physics and ultrafast process" which is imbursed by the national " the ninth five-year plan". The main work I have done are :1. The issue on group velocity dispersion, self phase modulation, Kerr-lens mode-locking and self-starting of laser oscillator has been studied, and the compensation for astigmatic of cavity and for dispersion of self-mode-locked femtosecond Ti:Sapphire oscillator are also analyzed. Based on these, some experiments are developed. After optimizing, lOfs, 82MHz, 800m W pulse train are directly achieved.2. The aberration-free grating stretcher is revised and designed, after optimizing all of the system, the stretching factor of 61552.1 is obtained, the duration of pulse from stretcher is 615.52 ps. A matrix formalism which can be used to analyze the dispersion system conveniently is obtained by introducing a dispersion term based on the ABCD matrix formalism, GVD and TOD of aberration-free grating stretcher are achieved conveniently and truly using the matrix formalism. The formula of calculating the stretching factor is revised, when TOD is considered, the stretching factor of aberration-free grating stretcher can be calculated accurately. This part work is my emphasis.3. Chirped pulse laser amplifying theory is analyzed, and various nonlinear effects in the process of chirped pulse laser amplification are discussed too. Based on these, some measures are given to eliminate them.4. The value of dispersion introduced by grating compressor is calculated using matrixformalism. The issue of dispersion compensation in chirped pulse laser amplifier system is discussed too. In addition, the dispersion compensation for aberration-free grating stretcher is evaluated.5. Some experiment are developed based on the technology of pulse duration measure of femtosecond pulse and single pulse selection from pulse train, some good results are achieved.更多还原