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题名	高能超宽带激光传输中的精密色散控制理论和技术
作者	王楠楠
学位类别	硕士
答辩日期	2012
授予单位	中国科学院上海光学精密机械研究所
导师	谢兴龙
关键词	高功率超短脉冲 宽带 剩余色散 色散控制和补偿 Grism
其他题名	The theory and technology of dispersion precisely controlled in the high-energy ultra-broadband laser transmission
中文摘要	随着激光脉冲朝着脉宽更短、带宽更大、能量更高的方向发展，系统中的剩余色散对脉冲质量的影响更为重要。短的脉宽对应着宽的带宽，意味着更容易受色散的影响。即使残留的少量高阶色散，仍会影响输出脉冲的强度对比度、信噪比和光束质量；由于能量的提高，系统的规模变大、光路变长、光学元件增多、光束口径变大，激光技术也更加复杂，因此，如果不能对系统中的各种色散加以分析和控制的话，必定无法实现几十飞秒的高质量的短脉冲输出。 目前，高功率超短脉冲激光系统的发展主要有两个方向，一个是脉宽为皮秒量级的高能量的超短脉冲激光系统，主要用于ICF快点火研究；另一个是脉宽通常几十飞秒的超高峰值功率输出的激光系统，这类激光主要用于强场以及相关的物理研究，一般要求输出高的峰值功率，对激光能量的要求不高。本课题主要是结合第二个研究方向，同时根据我国未来超高功率超短脉冲激光技术发展的要求，开展一系列相关的理论和实验探索工作。 文中首先概述了高功率超短脉冲的发展历程及应用，阐述了色散对高功率超短脉冲输出的影响，并简单介绍了国内外高功率超短脉冲系统常用的色散控制技术及手段；其次，详细叙述了飞秒脉冲展宽放大压缩过程中的色散源，从根本上了解色散产生的机制，并详细介绍了棱镜对、光栅对、啁啾镜、可编程声光滤波器以及Grism色散控制补偿技术；接着，针对Grism两种典型模型：平面Grism以及立体Grism进行了详细分析，采用光线追迹模拟计算了两种模型中各个结构参数与其色散特性的关系；并对光线追迹过程中附加相位的计算进行了详细讨论；文中还对808nm波段系统中剩余色散对输出脉冲波形的影响以及剩余色散的补偿分别进行了分析和设计；文中最后一章讨论了非线性光参量放大过程中，信号光啁啾脉冲波形对放大系统输出脉冲波形的影响，通过模拟仿真，从理论上证明通过对信号光时间波形整形，可改善输出脉冲的频谱，提高输出脉冲质量，获得脉宽更短、峰值功率更高的脉冲。 本文的创新点在于： 1) 本文的研究瞄准了超高功率的高能超短脉冲激光的控制和传输问题。针对几十到几百焦耳的OPCPA超短脉冲系统进行研究，不但具有创新性，也直接服务于我国超短脉冲激光发展的下一步规划； 2) 本文详细分析了一种新的色散控制结构——光栅-棱镜结合（Grism），对其色散特性进行了详细的分析和讨论，最后通过合理设计结构参数针对808nm系统的剩余色散进行了补偿。数值分析显示，该结构可以完全补偿系统的三阶色散并降低更高阶色散的影响； 3) 基于对光参量啁啾脉冲放大过程的数值模拟，讨论了信号光时间波形对OPCPA输出脉冲波形及光谱的影响，证明了在时域半高全宽相同时，一阶高斯型信号光脉冲相对于超高斯型脉冲，经OPCPA放大后，能获得更宽的光谱和更高的转换效率，这也是获得十飞秒级压缩脉冲的一条技术途径。
英文摘要	As the development of laser applications in science and technology, laser pulses of shorter temporal bandwidth, larger spectral bandwidth and higher energy are demanded, as a result, residual dispersions in such laser systems play a more important role. Shorter temporal bandwidth predicates larger spectral bandwidth, which means that the pulse waveform and contrast in spectral domain is more vulnerable to the residual dispersion of higher orders. To gain pulses of higher energy, laser systems tend to be more complicated with longer optical path, more optical components, and larger beam caliber, which require more accurate dispersion control. It’s impossible to realize high-quality output of tens of femtoseconds short pulses without dispersion compensation components in amplification systems. Now, two main themes about high power ultra-short pulse laser system are on developing. Firstly, huge laser facilities with output pulses of energy exceeding kilo-joules and duration in picosecond level are constructed for the “Fast Ignition” in ICF (Inertial Confinement Fusion, ICF) research. Secondly, ultra-high peak power laser systems are required for research in high intensity laser physics, and pulses in such systems are of several optical cycles. There are just general requirements for high output peak power, but not laser energy. This thesis will carry out a series of related theoretical and experimental job with a combination of the second research direction, according to the requirements of ultra-high power ultra-short pulse laser technology development in the future. First, this thesis summarizes the progress, development and application of high power ultra-short pulse, it also describes the influence of dispersion on high-power ultra-short pulses output. And it briefly introduces the technology and means of dispersion control in high-power ultra-short pulse domestic and foreign. Secondly, it describes the dispersion source in the process of broadening, amplification, compression of femtosecond pulse. And the mechanism of dispersion is understood fundamentally. And it describes the prism pair, grating pair, chirped mirrors, acousto-optic programmable dispersive filter(AOPDF), the techniques of dispersion control and compensation of grism. Then, it analyses two typical models of grism, 2D-grisms and 3D-grisms. It simulates the relationship between the various structural parameters and dispersion characteristics by ray tracing in two models. The calculation of the additional phase in the process of ray tracing is discussed in detail. The influence of output pulse waveform and the residual dispersion compensation are also analysed and designed in 808nm system. Finally, we discuss the impact of different signal chirped pulse waveform on output pulse amplification in nonlinear optical parametric amplification (NOPA). And theoretically proved that，temporal shaping will help to improve the spectrum of the output pulse and the quality of the output pulse, and thus obtain a shorter width, higher peak power pulse. The main innovations of this thesis are listed as the follows: 1) This study aimed at the high-energy ultra-high power ultra-short pulse laser control and transmission. It aims at the ultra-short pulse OPCPA system for tens to hundreds of joules, which is not only innovative, but also the direct services for the development of ultra-short pulse laser in the future. 2) In this paper, a detailed analysis of a new dispersion control structure, combination of grating and prism, we called Grism, is provided. There is a detailed analysis and discussion about its dispersion characteristics. We compensated the residual dispersion of the 808nm system through the rational design of structural parameters of 3D-Grism. The numerical analysis shows that the third-order dispersion can be fully compensated and the impact of the higher order dispersion can be reduced by this new kind structure. 3) The paper discussed the impact of temporal waveform about the signal light on OPCPA amplified spectrum, based on the numerical simulation of optical parametric chirped pulse amplification. We proved that the output spectrum and the conversion efficiency after OPCPA will be much wider and higher with the signal light as the first-order Gaussian pulse，relative to the super-Gaussian pulse which at the same full width at half maximum(HWFM). This is a technical way to get ten femtosecond compressed pulse.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16715]
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	王楠楠. 高能超宽带激光传输中的精密色散控制理论和技术[D]. 中国科学院上海光学精密机械研究所. 2012.

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