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题名	固体热容激光介质热致效应及热管理技术的研究
作者	侯立群
学位类别	博士
答辩日期	2007
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	固体激光器 热容激光器 热效应 热管理 有限元分析 薄片激光器
其他题名	Thermal effects and thermal managements in a solid state heat capacity laser
中文摘要	高功率、高亮度激光有着极其重要的应用价值。固体热容激光器以其独特的运转方式，有效避免了实时冷却固体激光器中由于冷却梯度造成的各种不良热效应，有望成为实现电激励、节能型、高平均功率、高亮度激光输出的有效手段之一。 热管理系统是热容方式工作激光系统最关键的子模块之一，如何有效管理并合理控制激光介质在周期性抽运负载作用下产生的废热，是一个亟待解决的新颖课题。本论文主要针对固体热容激光器增益介质的瞬态热致效应及热管理系统的原理设计展开研究，主要贡献或创新点如下： 1）、结合固体热容激光器的技术特点，系统地分析了目前国内外关于固体热容激光器（SSHCL）的最新技术进展及发展趋势。基于SSHCL总体设计方案，对构成该激光系统的原理设计方案及其总体设计中的功率标定等问题进行了阐述。 2）、基于传热学理论，建立了固体热容激光介质在抽运光热作用下描述其内部热分布的数学模型；借助有限元仿真软件ANSYS，对几种掺钕激光介质在热容方式下的热力学特性进行了数值模拟，重点对双侧对称激光二极管阵列抽运掺钕钆镓石榴石激光晶体（Nd:GGG）在热容工作下的瞬态温度场及应力场进行深入的研究，分析了多种复杂边界条件下热致效应对激光输出特性的影响。总结出高功率全固态激光系统在热容运转方式下受热负载的规律。 3）、通过模拟计算热容激光介质在冷却阶段中，不同冷却方式下的温度及热致效应的变化过程，以及冷却相关参数对换热效果的影响，研究了适用于热容板条固体激光器的冷却手段，总结出SSHCL冷却阶段激光增益介质的冷却特性。 4）、通过分析热容激光介质的冷却特性，结合实际激光器件的构型，提出了一套能实现板条热容激光介质良好热流控制和高效冷却的热管理系统方案。通过数值模拟，验证了该方案的可行性。 5）、提出了一种薄片激光器热管理结构的设计方案。该结构由双薄片激光增益介质及双金刚石热沉组成，冷却介质在两片金刚石热沉之间形成的冷却通道内流通。通过计算，将其与其它热管理结构的冷却效果进行对比，验证了该热管理结构的可行性。它适合于实时冷却方式运转的薄片激光器，具有易于实现模块化和功率的定标放大等特点。 本论文的研究工作将为高功率、大能量固体热容激光系统的总体设计特别是热管理系统的设计提供重要的、可供参考的依据，同时对实时冷却方式工作的激光系统也具有重要的参考价值。
英文摘要	A laser beam with high average power, good beam quality has a highly bright future in practical applications. Solid state heat capacity laser (SSHCL) is one of the most hopeful methods to realize a high-power, high brightness laser with battery-powered because its unique operating mode could avoid adverse thermal effects effectively. Among all the subsystems constituting a SSHCL device, thermal management system is a very important one. And how to control the waste heat within the laser gain medium effectively is a novel question which remains to be solved. This article aims at the researches on transient thermal effects of the gain medium and the design of thermal management system in a SSHCL, main contributions of this dissertation are as below. Firstly, the recent worldwide advances of SSHCL were reviewed when taken its technical features into account. And some related designing problems in principle design such as laser material, pumping configuration and power scaling were discussed. Secondly, based on fundamental theory of heat transfer, the mathematical models describing the thermal distributions in laser medium were deduced. By means of finite analysis using ANSYS, the transient temperature fields and stress distributions of some Nd-doped laser materials were simulated as Nd: GGG was mainly investigated. Furthmore, the influences of thermal effects with various complex boundary conditions on output laser were analyzed. Thirdly, the thermal distributions within laser medium during the cooling procedure of SSHCL were studied when different cooling methods were adopted, and then the cooling methods suitable for a SSHCL were discussed. At the same time, the influences of some cooling parameters on the cooling effects were also investigated. Fourthly, a thermal management method was proposed to achieve effective cooling and well controlment of heat flow in a slab SSHCL which was a common used configuration. Its feasibility was verified by numerical simulations. Finally, a cooling configuration utilizing double diamonds heat sinks placed at interval was devised to cool two laser disks which were mounted each outsides as well as the coolant flow adjacent to their inner faces. When compared to the other cooling schemes, numerical simulations on the temperature fields and stress distributions in laser disks were given and the results proved that the method mentioned is feasible to high power disk laser. The research results will provide some useful references to general design of a high power SSHCL system as well as steady state laser system, especially for designing the thermal management system.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15613]
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	侯立群. 固体热容激光介质热致效应及热管理技术的研究[D]. 中国科学院上海光学精密机械研究所. 2007.

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