QQ客服 官方微博 反馈留言

题名	高功率超短啁啾脉冲放大技术研究
作者	周剑
文献子类	硕士
导师	谢兴龙
关键词	超短超强脉冲，啁啾脉冲放大，能量稳定性，近场均匀性 ultra-short and ultra-intense laser pulse, chirped pulse amplication, energy stability , near-field uniformity
其他题名	Research on High Power Ultra - Short Chirped Pulse Amplification Technology
英文摘要	自从激光技术诞生以后，超短超强激光技术不断发展，已成为激光技术领域重要的研究方向之一。超短超强激光聚焦后所形成的超高功率密度能在实验室内产生极端的物理条件，推动了诸多研究领域的进步，包括X射线研究、粒子加速器、核物理等。因此，研制高功率超短脉冲激光装置，对基础物理研究具有重要意义。由于目前光学元件、激光增益介质等诸多因素的限制，获得超短超强激光脉冲必须对超短脉冲种子光进行多级放大，啁啾脉冲放大技术是目前普遍采用的激光脉冲放大技术。对于高功率超短脉冲激光装置，多级放大器的优化设计至关重要，本文针对研制高功率超短脉冲装置的实际需求，围绕啁啾脉冲放大技术，从理论和实验两方面展开相关研究。 一、理论上完成啁啾脉冲放大过程方程组推演与数值建模。从麦克斯韦方程出发，详细推演描述啁啾脉冲放大的三个基本方程，给出啁啾脉冲在激光增益介质中的传播放大计算方程，并完成编写Matlab数值建模程序，该数值模型可用于啁啾脉冲的放大特性理论分析与激光装置放大系统优化设计。 二、完成808nm波段、脉宽30fs量级、峰值功率超过200TW的超短脉冲激光装置的全放大链路优化设计。根据编写的计算程序，对各级放大器的参数，包括泵浦能量、泵浦光和信号光口径、放大通数、晶体长度等进行优化计算，在达到设计要求的条件下提高了放大器的效率。分析了各级放大器输出信号光的近场分布特征和能量稳定性，结果表明：注入的近场高斯分布信号光的均匀性在放大过程中得到明显改善；泵浦光的能量稳定性对放大器输出能量稳定性的影响大于注入信号光对放大器输出能量稳定性的影响。 三、实验上进行超短脉冲激光装置小型化前端预放大器研究。依据优化设计方案，完成搭建14通环形放大器结构，实现信号光14通放大，验证了实验设计方案。 四、基于SGII-5PW激光装置第二级参量放大器实验数据，分析了大能量OPCPA放大器中信号光近场均匀性的影响因素及其 填充因子和通量对比度在放大过程中随晶体长度的演变特性，并与实验数据对比，发现泵浦光的光束质量对信号光近场均匀性的影响尤为重要，远大于注入信号光近场均匀性的影响，该项工作对SGII-5PW激光装置在1~5PW放大级的信号光近场均匀性优化具有指导意义。 填充因子和通量对比度在放大过程中随晶体长度的演变特性，并与实验数据对比，发现泵浦光的光束质量对信号光近场均匀性的影响尤为重要，远大于注入信号光近场均匀性的影响，该项工作对SGII-5PW激光装置在1~5PW放大级的信号光近场均匀性优化具有指导意义。; Since the invention of laser technology, ultra-short and ultra-intense laser develops rapidly and has become an important research direction in the field of laser technology. The ultra-short and ultra-intense laser can create extreme physical conditions with ultra-high focused power density in labora?tory that prompts many research fields, including X-ray, particle accelerators, and nuclear physics. Therefore, building high power ultra-short laser facility is of great significance for basic physics research. Because of the limitations of optical components and laser gain media, it is necessary to amplify the seed light by multi-stage amplifiers to obtain broader banwidth and higher energy laser pulse. Chirped pulse amplification technology is the key amplification technology. The optimization design of multi-stage amplifiers is very important for high power ultra-short pulse laser facility. To meet the actual demand to build high power ultra-short pulse laser facility, this paper studies the chirped pulse amplification technology theoretically and experimentally. Firstly, the equation group describing chirped pulse amplification process was deduced and numerical simulation with Matlab was completed. The three basic equations describing the chirped pulse amplification were deduced based on Maxwell equation in detail. Then the equation group is given that was used to calculate the propagation and amplification of the chirped pulse in laser gain medium and the numerical simulation program was written with Matlab. The numerical simulation program can be used to analyze the amplification characteristics of chirp pulse theoretically and optimize the design of amplification system. Secondly, the design of all amplifiers of a ultra-short pulse laser facility were optimized which can produce a laser pulse with a peak power of more than 200TW, for a pulse duration of 30 fs. According to the calculation program, the parameters of the amplifiers at all levels are optimized, including the pump energy, the pump light and the signal light diameter, the pass number and the crystal length. The energy stability and near-field distribution of amplified signal light are analyzed. It is found that the amplified signal beam uniformity is getting better and the energy stability of the pump light has more influence on the energy stability of amplified signal light than the injected signal light. Thirdly, research on pre-amplifier for high power ultra-short laser facility is done. According to the optimized design scheme, a 14-pass amplifier is completed on experiment and the amplified signal light is measured that verified the design scheme. Based on the experimental data of the SGII-5PW laser facility, the influence factors of the near-field uniformity of the signal light in the high energy OPCPA amplifier are analyzed. Compared with the experimental data, it is found that the beam quality of the pumped light has more influence on the near-field uniformity of signal light than the injected signal light. This work can guide the optimization for the near-field uniformity of SGII-5PW laser facility at 1 ~ 5PW output power. has more influence on the near-field uniformity of signal light than the injected signal light. This work can guide the optimization for the near-field uniformity of SGII-5PW laser facility at 1 ~ 5PW output power.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/30958]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	周剑. 高功率超短啁啾脉冲放大技术研究[D].

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。