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题名	飞秒超高功率压缩器系统的失调问题研究
作者	夏素秋
学位类别	硕士
答辩日期	2016
授予单位	中国科学院上海光学精密机械研究所
导师	朱健强
关键词	光栅 脉冲压缩 探测 光栅调节
其他题名	The research on misalignment of ultra high power and ultrashort femtosecond compressor systems
中文摘要	为了产生高功率、超短激光脉冲，最关键的环节是啁啾脉冲放大（CPA）系统。在CPA系统中，展宽器和压缩器在不同级次相位色散的匹配程度直接决定了出射光束的质量。所以压缩器的好坏直接影响整个系统的作用效果，而在实际工程中，压缩器往往置于真空压缩室中，由于调整架机械性能不稳定性及气流等因素的影响，光栅会不可避免地偏离理想位置，从而影响了出射光束的质量。因此，光栅压缩器的失调是个亟待解决的问题。而从工程效率出发，对于真空压缩室失调光栅的调控须具备远程控制、自动化调节、快速校准等特点，这是目前国际上的一个难点。 在前人的研究中，调节光栅的传统思路都是把第一块光栅作为基准固定住，调节相邻光栅与基准光栅的平行度，但是对于放在真空室里面的压缩器来说，基准光栅也存在失调问题，目前国际上针对这个问题提出的解决方案存在以下弊端：结构复杂、精度不高。针对上述问题，本文的研究内容如下： 1、将光栅压缩器系统的失调分解为不同的扰动源（入射光角度失调，位移失调，光栅三维角度失调）。针对光束通过光栅压缩器的过程编写了模拟程序，系统研究了不同扰动源的失调对出射光束相关参数的影响，并由此确定了工程上真正需要关注的扰动源。 2、针对双通压缩器和单通压缩器构型设计了相应的监控装置和调节方案，通过监控系统的自相关仪监测脉宽变化，通过远场探测系统监测角啁啾的变化，根据分离变量的思想将真空压缩室任意状态下可能存在的失调调节回来。此方案具有结构简单、精度高及快速自动化调节的优点。 3、针对单通压缩器进行了光栅压缩器调节实验，对于未封装的压缩室，采用手动调节，结合模拟中得到的失调与空间啁啾、脉冲宽度的关系，去除失调光栅的空间啁啾影响，并获得30fs的超短脉冲输出。
英文摘要	To produce high power and ultrashort laser pulse, the most crucial element is chirped pulse amplification (CPA) systems. In CPA systems, the degree of matching between the stretcher and compressor’s phase dispersion plays an important role in the quality of the output light beam. So the quality of compressor has a direct influence on the whole system. However, in the practical projects, compressor is always dropped in the vacuum chamber. In the vacuum chamber, gratings would gradually shift from the original location inevitably because of the instability of mechanical properties and airflow’s influence. This phenomenon would have obvious influence on the quality of output beam. As a result, the misalignment of grating compressor is an urgent problem to be solved. From the perspective of engineering efficiency, It had better have the merit that remote controlling, automatic adjustment, fast calibration for the misaligned gratings in the vacuum compressor. That is a difficult point worldwidely. Based on the previous research, the traditional method of adjusting gratings is that one grating must be fixed as a reference. Then the parallelism between reference grating and other gratings is adjusted. But for the compressor in the vacuum chamber, misalignment is also exist in the reference grating. Nowadays, the total solutions been proposed internationally have some common defects: complex structure and low accuracy. To solve the above problems, the research contents of this paper are showed below: 1. The misalignment of gratings was decomposed into several disturbing source(misalignment of angle of incidence, misalignment of gratings’ location, misalignment of grating’s angle). A program has been coded to simulate the process of light beam propagating in the compressor. The disturbing sources that should be eliminated were confirmed based on the results of simulation. 2. The monitoring device and regulation scheme accordingly were designed based on two-pass and single-pass grating compressors construction. In monitoring device, autocorrelator was used to detect variation of pulse width. Far field detecting system was used to monitor angular chirp’s change. According to the theory of variable separation, the misalignment at any condition in vacuum chamber could be regulated to the ideal condition in this way. This scheme also has merits of simple structure, high accuracy, fast automatic controlling. 3. An experiment was conducted based on single-pass grating compressor structure. For unencapsulated compressor chamber, four gratings were regulated manually, combined with the relation between misalignment and angular chirp as well as pulse width. At last, the influence of angular chirp was been eliminated and the ultrashort pulse with 30fs pulse width was acquired.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16996]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	夏素秋. 飞秒超高功率压缩器系统的失调问题研究[D]. 中国科学院上海光学精密机械研究所. 2016.

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