| 题名 | 高能钕玻璃激光系统前端及增益特性实验研究 |
| 作者 | 刘晶 |
| 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 | 施翔春 |
| 关键词 | 激活反射镜 钕玻璃 再生放大 Nd:YLF晶体 |
| 其他题名 | Experiment Research on Front-end and Gain Characteristic of High-energy Nd: glass Laser System |
| 中文摘要 | 能源危机是目前人类社会实现可持续发展道路上需要解决的问题之一。利用可控激光核聚变产生取之不尽的清洁能源成为解决能源危机的重要途径之一。在激光驱动装置建设的浪潮下，基于传统透射构型钕玻璃激光驱动装置的经验，我们拟探究一种新型的激活反射镜式钕玻璃放大器构型，通过提高能量抽取效率，达到减小大口径钕玻璃用量，降低激光驱动装置单路建造成本。 基于课题背景本论文围绕新构型高能钕玻璃激光系统做了如下工作： （1）调研了目前国内外高能钕玻璃激光驱动系统的发展现状和激活反射镜式构型在激光领域中的应用；阐述了课题的研究意义。 （2）介绍了再生放大系统的工作过程和基本特性；理论分析了激光脉冲大过程中的能量变化和时域脉冲畸变；总结概括了脉冲放大过程中的增益受限因素以及再生放大腔的设计要求。 （3）设计并搭建了一台Nd:YLF再生放大器。利用KTP晶体对1053nm连续光进行斩波，得到能量~0.3 nJ的种子激光脉冲。利用再生放大器对种子脉冲进行放大，输出脉冲能量7.19 mJ，总增益达107以上，输出激光脉冲能量稳定性（连续工作1 h）RMS值1%，PV值4.7%。 （4）搭建了一套大口径激活反射镜式高能钕玻璃激光放大器实验装置。实验探测了钕玻璃激光系统的增益特性。得到了该构型下钕玻璃激光系统的可靠实验数据，注入氙灯能量334 KJ，小信号增益系数达0.0371 cm-1,对应储能效率1.94%。在现有能源条件下，优化能源配置，增大泵浦能量后进一步进行了实验探究。实验探究了不同掺杂浓度（2.2 wt.%和3.5 wt.%）钕玻璃激光系统在新构型下的增益特性。掌握了该构型下的可靠实验数据，为建立此构型下理论模型提供了依据；丰富了工程建设经验，减小了后期工程建设中的技术风险。 |
| 英文摘要 | Energy crisis is one of the problems that need to be solved in the roads of the human society sustainable development. It is one of the important ways to solve the problem of energy crisis that making use of controlled laser nuclear fusion to produce inexhaustible clean energy . In the big wave of the constructing the laser driving device ,we summarize the experience of the traditional transmission type Nd:glass driving device and plan to explore a new type driving device that is active mirror type. We hope to decrease the cost of a single of laser driving device by enhancing the extract efficiency and reducing the dosage of large aperture Nd:glass . Based on the background of this paper, the main work about high-energy Nd: glass laser system are presented: (1) The development of the high-energy Nd:glass laser system and the application of active mirror are presented. The research significance is discussed. (2) A complete introduction of regenerative amplifier is presented, including the working process and performance. The amplification characteristic of the regenerative amplifier is analyzed , including the changes of output energy and temporal pulse waveform .The design requirements of the regenerative amplifier are presented. (3) A Nd:YLF regenerative amplifier system is designed .The seed laser pulse is achieved by chopping the 1053nm continuous laser using the KTP crystal .The energy of the seed laser pulse is ~0.3 nJ . It is amplified by Nd:YLF regenerative amplifier .The output energy of laser pulse is 7.19 mJ ; a total gain is more than 107, The stability of output energy (in 1 hour) RMS = 1%,PV = 4.7% (4) The structure of large aperture active mirror slab amplifier is presented, which is pumped by Xe-lamps. The small signal gain coefficient and energy storage efficiency of different voltages are measured at the best delay time. The energy storage efficiency is 1.94% and the small signal gain coefficient is 3.71% cm-1 when the energy of Xe-lamp is 334 KJ. Under the condition of existing energy, energy configuration is optimized, The gain characteristic of Nd:glass laser system are explored after increasing the pump energy. The experiments results of Nd:glass ( 2.2 wt.% and 3.5 wt.%) are presented. we grasp the reliable experimental data of the active mirror type which is very significant to build the theory model. Rich the experience of engineering construction and be good for reducing the technical risks in later project construction. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16776]  |
| 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 | 刘晶. 高能钕玻璃激光系统前端及增益特性实验研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
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