基于多片式气冷的钕玻璃放大模块热效应研究
文献类型：学位论文
| 作者 | 徐鹏翔 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 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 | 气冷技术 多片式放大模块 波前畸变 有限元分析 二极管抽运 |
| 其他题名 | Heat Effect Research of Multiple-piece Gas-cooled |
| 中文摘要 | 随着激光驱动器技术的发展，下一代激光器驱动装置对能量转换效率和重复频率提出了更高要求。高重复频率导致介质内存在热积累，引起热光效应、弹光效应、形变，导致波前畸变的产生，甚至导致介质断裂，最终制约激光输出能量，导致激光系统的能量损耗和光束质量退化。为解决这一问题，必须对热管理开展研究。国内外多家机构建立了小口径下的重复频率固体放大技术研究平台，本文采用最适于透射式系统的多片式放大模块结构，基于设计参数开展热效应研究，主要研究工作如下： 1. 建立了多片式放大模块热分析模型，分析了大口径和小口径下的温度、形变、应力分布情况，并得到总畸变以及热光效应、形变、弹光效应对波前畸变的贡献量。 2. 开展小口径下多片式气冷的验证实验，通过小能量下实验结果与数值计算结果的对比，验证热分析模型的正确性。 3. 研究对流换热系数、单片钕玻璃厚度对波前畸变的影响，分析各因素的改善对提高波前质量的有效性。 4. 分析了通过边缘加热的方式改善波前畸变的能力。通过主动控制钕玻璃四个侧面的温度，减小泵浦区域内的温度梯度，从而减小波前畸变。得到了小口径下介质温度分布、x方向应力分布、波前畸变随加热温度的变化。通过介质断裂应力的判断，选取最佳加热温度，分析其对波前畸变的改善。 |
| 英文摘要 | With the development of the laser drive technology, the next generation of laser driving device will have higher requirements on the energy conversion efficiency and repetition frequency. High repetition frequency leads to memory medium heat accumulation, causing thermo-optical effect, elasto-optical effect and bulk displacement, resulting in the generation of wavefront distortion, affecting the beam quality. To solve this problem, it is necessary to research on thermal management, and many institutions at home and abroad has set up research platform for high-repetition rate small-diameter solid amplification technology. In this paper, we carry out laser thermal management research and establishing thermal analysis models of multi-disk amplifier using the finite element analysis. The main work of this thesis is as follows: 1. Established the thermal analysis model of multi-disk amplifier module and analyzed the temperature distribution, deformation, stress distribution under large and small diameter of mediums, and calculated the total distortion and the contribution of thermal light effect, deformation, elastic photosynthetic efficiency to wavefront aberration. 2. Carried out experiments on small-diameter air-cooled multi-disk amplifier, verified the thermal analysis model through the comparison of experimental results with numerical results, 3. Analyzed the effect of convective heat transfer coefficient, monolithic neodymium glass thickness on the wavefront aberration. Analyzed the scale of improvement on the quality of the wavefront by changing the two factors. 4.Analized edge-heating method to improve wavefront aberrations.Reduce the temperature gradient pump area by active controlling the temperature of four sides on a neodymium glass, thereby reducing the wavefront aberration. Temperature distribution, stress distribution in the x direction, wavefront distortion along with the change of heating temperature is obtained in the case of small aperture medium. With fracture stress of the medium taken into consideration, choosed the best heating temperature and analyzed the improvement of the wavefront aberration. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16877]  |
| 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 | 徐鹏翔. 基于多片式气冷的钕玻璃放大模块热效应研究[D]. 中国科学院上海光学精密机械研究所. 2014. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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