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题名	半导体激光侧面抽运Nd：YAG 300Hz再生放大器技术研究
作者	张若凡
学位类别	硕士
答辩日期	2013
授予单位	中国科学院上海光学精密机械研究所
导师	李学春
关键词	重复频率激光器 Nd:YAG晶体 LD抽运 再生放大器 热透镜焦距
其他题名	LD Side-pumped Nd:YAG 300Hz regeneration amplifier
中文摘要	在高功率激光装置中，光学元件的损伤阈值已成为限制大口径大能量激光系统发展和应用的主要因素。提高光学元件的抗激光损伤能力即提高元件损伤阈值，以延长光学元件寿命是目前研究中面临的重要课题之一。 激光辐照光学元件表面对光学元件损伤点进行预处理，是提高元件抗激光损伤能力的一种有效手段，同时也是光学元件损伤点修复的必要步骤。在此研究领域，中低重复频率（10Hz~1KHz）激光器有着重要的研究意义与应用价值。 本论文的主要工作是研究重复频率激光器的关键组件——再生放大器。选用Nd:YAG为增益介质，对再生放大器进行设计和实验研究，围绕此课题开展了如下工作： （1）明确课题研究背景和选题意义，调研了重复频率激光器和再生放大器的研究进展； （2）介绍了再生放大器谐振腔设计理论，从基本腔型结构、腔内光束分布、谐振腔热稳定性、谐振腔失调灵敏度等方面进行分析，明确设计思路和要求；分析了种子脉冲在谐振腔内的放大过程，对再生放大器增益介质内能量变化过程和增益饱和效应进行研究； （3）阐述了激光增益介质Nd:YAG的物理特性、光学特性、光谱特性，简要分析其热效应，并实际测量其等效热透镜焦距，以此提出再生放大器腔型设计方案； （4）搭建一台高稳定性半导体激光侧面抽运Nd:YAG300Hz再生放大器样机，输出指标为：重复频率300Hz，脉冲宽度2ns，单脉冲能量1.5mJ，1.5小时内的稳定性为1.08%（RMS值）。
英文摘要	In the high-power laser system, the damage threshold of the optical components has become a major factor which limiting the development and application of the laser system. Improving the laser induced damage of optical components, in other words, increasing the damage threshold, in order to extend the life of optical components is one of the most important issues. The laser irradiation pretreatment of the damage points on surface of optical components is an effective means of increasing damage threshold, meanwhile it’s a necessary step in the optical component damage points repairment. In this research area,low repetition frequency (10Hz to 1kHz) laser has important research significance and application value. The main work of this thesis is about the key components in repetative laser system- the regenerative amplifier. The Nd: YAG crystal is selected as gain medium, some theoretical analysis and experimental research have been done, and ultimately the the seed pulse of repetition frequency of 300Hz has been amplified. The thesis contains several parts as fellow: (i) summerizes the research background, the purpose of the study, reviews the research statues of the laser system as well as the development of regenerative amplifier. (ii) The theory of regenerative amplifier cavity designing has been described, including basic cavity structure, the cavity beam distribution, the resonator thermal stability, cavity offset and sensitivity analysis, the requirements have been presented. The amplification process of the seed pulse in resonator cavity has been analysised, and some theoretical study have been done about the energy change process in regenerative amplifier gain medium and the gain saturation effect. (iii) The physical properties, optical properties, spectral characteristics profile of the selected gain medium Nd: YAG crystal have been reviewed; The pump structure, including end-pumped and side-pumped structure as well as the laser pump module in this regenerative amplifier have been eleborated. The cause of Nd: YAG crystal thermal effect has been analysised, and a measurement method of the crystal equivalent thermal focal length has been proposed, which hase been used to measure thermal focal length of the crystal used in this regenerative amplifier, according to which the design of cavity has been proposed. (iv) Based on the analysing results, a high-stable LD side-pumped Nd:YAG regenerative amplifier experimental device has been set up, the output properties are as follow: the repetiton rate is 300Hz, the pulse width is 2ns while pulse energy is 1.5mJ, the output stability within 1.5 hours is 1.08%(RMS).
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16754]
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	张若凡. 半导体激光侧面抽运Nd：YAG 300Hz再生放大器技术研究[D]. 中国科学院上海光学精密机械研究所. 2013.

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