| 题名 | 三倍频模拟激光光源的研究 |
| 作者 | 李银柱 |
| 学位类别 | 博士 |
| 答辩日期 | 2002 |
| 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 | 三倍频 模拟光源 被动调Q 靶定位 |
| 其他题名 | The development of tripling simulating laser source |
| 中文摘要 | 惯性约束聚变（IntertnalConfinementFusion-ICF）是当今国际上的重大基础科研课题，也是当今国际的前沿研究领域，有着极为重要的科学意义和国防价值。它对于开拓下世纪的新能源有着极其深远的科学研究意义和应用价值。其基本思想是用激光作为驱动源辐照装有氖氖聚变燃料的靶球，当燃料达到一定的高温高密度，满足热核点火条件时，便发生聚变反应，释放巨大能量。ICF的关键显然是激光驱动器，它是当今脉冲功率最高、规模最大，因而也最复杂的激光系统。我国在神光I，II的基础上已开始神光III大型激光装置的预研和工程研究，并已着手神光m原型单路集成平台的工程设计。在ICF物理研究过程中，用长波长激光打靶已完全不能适应物理实验的要求，随着惯性约束核聚变技术的发展，人们进一步认识到利用短波长高功率激光打靶的优越性，它不仅可以大幅度提高靶对激光的吸收率，大量减少超热电子的影响，而且受激Raman散射和Brinlouin散射等现象都将随波长变短而减小。目前世界上很多高功率固体激光装置都建立了三倍频系统，利用短波长激光（三倍频）打靶取了很好的结果。为了加速我国ICF实验研究，高功率固体激光装置一一"神光II"也将由基频光（1.053um，lω）打靶升级到三倍频光（0.3510um，3ω）打靶，那么原来的作为精确靶定位的基频模拟光源将难以满足定靶的要求，必须研究新的准直模拟激光。与主激光同轴、同波面、同波长的模拟光系统是实现靶场光路调整、靶位精密瞄准和精密调焦的重要保证，模拟光源对靶场光路中测试仪器的对准调整，3。晶体光轴的精密调试，也同样十分重要。本论文的主要工作包括以下几个方面：1．根据三倍频模拟激光源的需要研究了非稳腔在高功率激光器中的应用，主要研究了下面两种情况：1）非稳腔的基本理论及发展；2）非稳腔的设计及实验研究。2．对Cr4＋：YAG被动调Q进行了分析和实验研究。首先讨论了被动调Q的发展。同时利用速率方程对Cr4＋：YAG被动调Q的动力学过程进行了研究，并通过实验对利用Cr4＋：YAG被动调Q进行了进一步研究。3．运用棍合波方程对固体脉冲激光器件的三倍频理论进行了分析，根据分析的结果，给出了Cr4＋：YAG被动调Q的Nd:YLF激光器的三倍频的设计及实验结果。4．介绍了靶场三倍频模拟激光光源的研制，同时对紫外全固态激光器（DPL）的发展及其将在靶场模拟光系统中的应用进行了展望。 |
| 英文摘要 | Developing a new energy resource is very important in the next century. Inertial Confinement Fusion (ICF) is important research field today, which has an important scientific significance and application value in developing the new energy resource in the next century. Research on laser inertial confining fusion(ICF) which plays a critical role in the respects of national defense and energy resources field in the future,is a very important ultra-high intensity fundamental research field,and also is a frontier research field today in the world. ICF has important significance and practical value in developing new energy resources in the future. In the experiment of ICF, the laser will heat target sphere and fusion occurs in the sphere,releasing tremendous fusion energy. The high-power inertial fusion laser driver, playing a key role in further research of inertial confinement fusion, is a complex laser system, which works properly under condition of high power and of large energy. Completed the design of SG I and SGII, our scientist begin the investigation and pre-research work on SGIII project, which is the next generation ICF laser drive in China. In the mean time, engineering of test integration laser(TIL) was launched as a test platform for SGIII. During the development of ICF, it is recognized that to heat the fusion target with long wavelength laser driver cann't satisfy the demend of physics research. Short wavelength laser driver have more advantage,and it can improve the target absorb rate to the laser energy, and can weaken the influence of hot electron,and also can lower Raman scattering and Brillouin scattering. Most of the High-power laser set-ups have become to tripling frequency laser driver system today, and have obtained many achievements. With the developing of SG II ,the laser driver will progress to tripling frequency laser driver. To meet the requirement of the High Power Setup-SGlI,We must develop a set of tripling laser system for Simulating Light Source. The simulating light source which have the same optical axis, the same wavefront and the same wavelength with the main laser driver play a very important role in target field optical adjustment, target position orientation and instrument adjustment. The main idea of this thesis including: To satisfy the need of the SG II tripling simulating light source,we study the application of unstable resonator in solid laser, especially research the developing of unstable resonator basis theory, here also research the design methods and experiment result of unstable resonator. Analyse the Cr4+: YAG crystal as passive Q-switch ,and develop the experiment research of Nd:YLF laser using Cr4+: YAG as passive Q-switch. Firstly we discuss the progress of passive Q-switch, and study its dynamic process using velocity rate equation. Secondly we develop the experimental reseach to Cr4+: YAG passive Q-switch. With the coupling wave equation,we study the tripling theory for solid pulsed laser.According those results,we design a Cr4+: YAG Q-switch Nd:YLF laser tripling system,and the experimental results were obtained. Introducing the development of tripling simulating laser source,and give some respect to UV Diode-Pumped laser in tripling simulating laser source in the future. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15611]  |
| 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 | 李银柱. 三倍频模拟激光光源的研究[D]. 中国科学院上海光学精密机械研究所. 2002. |
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