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题名	ICF固体激光驱动器中的脉冲整形及再生放大
作者	王春
学位类别	博士
答辩日期	1999
授予单位	中国科学院上海光学精密机械研究所
导师	陈绍和
关键词	ICF固体激光驱动器 主振荡器 光纤堆砌器 集成光学波导调制器 任意整型电脉冲发生器 注入锁定 再生放大 附加脉冲锁模
中文摘要	ICF固体激光驱动器的前级系统作为一个高质量的种子光源，将为后级系统提供一个具有一定能量、带宽、高信噪比、高光束质量的整形脉冲。根据新一代ICF固体激光驱动器对前级系统的要求，前级系统主要包括主振荡器、脉冲整形器、分束器和再生放大器。本论文将LD泵浦技术、脉冲在光纤中的堆砌技术及集成光学技术成功应用于前级系统，实殃了前级系统全固化，大大提高了系统工作的可靠性和输出的稳定性。本文第一章综述了本论文有关的三方面文献。第一部分对目前世界上著名实验室（美国里弗莫尔实验室、美国罗彻斯特大学激光力能实验室、日本大孤大学激光工程研究所和中国科学院上海光机所高功率激光物理国家实验室）的高功率激光装置上的激光脉冲整形系统的必展及殃状进行了综述。第二部分综述国际上关于二极度管泵浦固体激光器（DPSL）的历史、现状及进展，阐述了DPSL较之于激光二极度管本身、闪光灯泵浦的固体激光器所独具的优点。第三部分介绍了单纵模激光的注入锁定及超短脉冲的再生放大技术的发展历程。第二章研究了激光二极度管泵浦的固体激光器。本章主要研究了三方面内容：第一采用新颖的腔结构、新的选单纵模技术为前级系统的主振荡器提供了几种方案；第二利用Cr~（4+）：YAG对红外光的饱和吸收特性在线性腔结构中实现Nd：YLF、Nd: YAG激光器的被动调Q，并对线性腔结构中Nd: YVO4激光器中没有实现调Q的原因做了简单分析；本章的第三部分实现了Nd: YLF、Nd：LMA激光器的附加脉冲锁模，获得了脉宽分别为2.0ps、1.8ps的锁模脉中，并分析了附加脉冲锁模的机理和自启动的机制。第三章分别利用脉冲在光纤中的堆砌技术和集成光学波导调制技术实现了单纵模激光脉冲的任意整形。详细讨论了光纤堆砌器和集成光学波导调制器的工作原理和获得任意整形光脉冲的具体实现方法，并获得了较为理想的结果。在任意整形电脉冲发生器的研制上，国内首次利用GaAs场效应晶体管的电压控制电流的开关特性实现了任意整形电脉冲的输出，为实现计算机控制的任意整形电脉冲源打下了坚实的基础。第四章研究了单纵模激光脉冲的再生放大理论和实验结果。当注入的单纵模激光脉冲宽度小于光脉冲在腔内的往返时间，则注入脉冲在腔内自身不发生干涉，副腔对注入光脉冲的标准具作用消失，同时由于副腔的往返时间及脉冲的宽度远大于增益介质的横向弛豫时间，增益介质在激光脉冲放大过程中不存在瞬态相干作用，副腔对激光脉冲在频谱上的调制作用消失，只起到来回放大的作用，避免了注入锁定中对主、副腔腔长匹配的要求。本章从电磁场的Maxwell方程和激活介质的Schroedinger方程出发推导了电场强度和反转粒子数的传播方程和输运方程，得到了光强和反转粒子数的解析方程。对再生放大器的脉冲建立过程中的脉冲变形、影响激光输出稳定性等因素进行了数值计算和分析。在实验中详细研究了激光脉冲从注入到再生放大脉冲的建立过程，在国内首次实现了LDA泵浦的高稳定章纵模激光脉冲的再生放大，获得了总增益为2×10~7高增益放大。
英文摘要	The front-end system of the ICF (inertial confining fusion) solid-state laser driver will provide a time shaping laser pulse with proper energy, proper bandwidth, high SNR (signal to noise ratio) and high quality for the rear system of amplifiers. The front-end system includes master oscillator, pulse shaping system, beam splitter and regenerative amplifier according to the demand of the ICF solid-state laser driver. In this paper, the front-end system is realized in all-solid-state with high reliability and stability by using LD pumping, pulse stacking in the optical fiber and integrated optics technology. In the first chapter, three-aspect literatures relating to the thesis are summarized. In the first part, it is stated and evaluated the present situation and the development of the pulse shaping system on the high power laser facilities in the world famous laboratories(Lawrence Livermore National Laboratory and Laboratory on Laser Energetics in America, Institute on Laser Engineering of OSAKA University in Japan and National Laboratory on High Power laser and Physics in Shanghai Institute of Optics & Fine Mechanics in China). In the second part, it is stated the history, present situation and development of the diode pumped solid state laser and its advantages compared with the laser diode itself and the flash-lamp pumped solid state laser. In the third part, it is introduced the development's course of injected locating of the single longitudinal mode laser and regenerative amplification of the ultra-short laser pulse. In the second chapter, diode-pumped-solid-state lasers (DPSL) are investigated. Three aspects are investigated in this chapter. In the first part, three kinds of single-longitudinal-mode (SLM) lasers are provided for the master oscillator in the front-end system by using novel cavity construction and new SLM selecting technique. In the second part, Nd:YLF and Nd:YAG linear cavity lasers passively Q-switched by Cr~(4+):YAG are realized, and the reason why passive Q-switching can not be realized in the linear-cavity Nd:YVO4 laser is analyzed. In the third part, additive-pulse mode-locking (APM) of Nd:YLF and Nd:LMA lasers with output pulse duration of 2.0ps and 1.8ps respectively are realized, and the mechanism of APM and self-starting is analyzed. In the third chapter, arbitrary time shaping of SLM laser pulse is realized by using pulse stacking in the optical fiber stacker and integrated optical wave-guide modulator. The mechanism and the way of realization of optical fiber stacker and integrated optical waveguide modulator are discussed in detail, and the satisfactory results are obtained in the experiments. In this chapter, arbitrary electrical waveform generator (AWG) is realized by using the voltage-controlled-current property of GaAs field-effect transistor (FET), this method will make the computer-controlled AWG possible. In the fourth chapter, the theory and experiment results on regenerative amplifier of the SLM laser pulse are investigated. In an amplified approach with a master cavity and a slave cavity, an injected pulse does not interfere with itself in the slave cavity and the etalon's function of the slave cavity to the injected pulse is eliminated as long as the pulse duration is shorter than the round-trip time in the slave cavity. And, the instantaneous coherent effect is non-existent because the transverse relaxation time of a solid-state laser medium is much shorter than the pulse duration and round-trip time in the cavity. Owing to the above causes, the slave cavity brings no modulation to the frequency of the injected laser pulse, only reflects the injected pulse back and forth, thus the requirement of cavity length match between the two cavities is not necessary. In this chapter, the propagation and transport equations about intensity of electric field and inverse population are derived from the Maxwell equations about intensity and inverse population are obtained. Calculating results about the buildup process of the regenerative amplified pulse, pulse reshape and output stability are given. The buildup process from the injecting to the dumping is discussed in detail in the experiment, the total gain as high as 2 * 10~7 of the regenerative amplifier for the SLM laser pulse is obtained. It's the first time to our knowledge to realize LDA pumped SLM laser pulse regenerative amplifier with great stability in our country.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15307]
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	王春. ICF固体激光驱动器中的脉冲整形及再生放大[D]. 中国科学院上海光学精密机械研究所. 1999.

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