| 题名 | 有源反射镜式片状放大器的仿真分析和实验研究 |
| 作者 | 刘秋菊 |
| 文献子类 | 硕士 |
| 导师 | 施翔春 |
| 关键词 | 片状放大器 slab amplifier Nd:LuAG陶瓷 Nd:LuAG ceramic 有源反射镜式 active mirror amplifier |
| 其他题名 | Simulation Analysis and Experimental Research on Active Mirror Slab Amplifier |
| 英文摘要 | 激光透明陶瓷除了具有与晶体一样良好的光学特性和物理化学性质，还易于大规模、大尺寸制备、激活离子可掺杂浓度高、材料均匀性好、生产周期短、成本低等优点；相比于玻璃，透明陶瓷还具有热导率高、高辐射阈值、单色性好等优点。综上，激光透明陶瓷成为继单晶和玻璃之后非常有潜力的激光材料。Nd:LuAG（ Nd:Lu3Al5O12）拥有小的发射截面，而且荧光寿命和热导率均较大；Nd:LuAG作为立方晶系，能够被加工成多晶陶瓷，可以较低成本地生产出大口径激光陶瓷。综合考虑材料特性和加工成本，这些都给Nd:LuAG激光透明陶瓷提供了很大的发展空间，所以Nd:LuAG激光透明陶瓷是未来发展高功率、大能量激光的有效材料。相较于传统的透射式片状放大器，有源反射镜构型片状放大器可以实现单程双通放大，能量提取效率高，而且表面热沉积可以通过直接接触流体进行冷却，有效地解决了激光增益介质热效应问题。综合以上分析，本论文以有源反射镜式片状激光透明陶瓷放大器为切入点，从片状放大器热畸变、储能、放大性能等方面对增益介质进行仿真和实验分析，为大能量激光材料选择等提供参考依据。 搭建了有源反射镜式片状放大器实验平台，采用信号种子光、助推放大器、主放大器结构，主放大器采用片状激活反射镜式构型。针对大口径有源反射镜圆片状Nd:LuAG陶瓷增益介质在高功率二极管泵浦条件下的热效应及其引入的波前畸变进行了分析，并分别从激光透明陶瓷储能角度和热畸变角度进行实验研究。以目前广泛被研究的Nd:YAG（Nd:Y3Al5O12）和Nd:LuAG为研究对象，采用蒙特卡洛方法对片状放大器的自发辐射光放大效应ASE (Amplified Spontaneous Emission)进行了仿真分析，分别针对圆片状Nd:LuAG陶瓷增益介质有无包边情况和矩形片状Nd:YAG晶体增益介质周边不同折射率匹配液情况对储能的影响进行了仿真分析；同时针对矩形片状Nd:YAG晶体开展了能量放大实验。 为了验证Nd:LuAG的储能特性，针对棒状Nd:LuAG陶瓷增益介质展开了光纤尾端泵浦的激光放大实验，搭建了激光器实验平台，并且在相同的前端调Q脉冲信号光注入和泵浦条件下对单、双程放大实验做了对比，从小信号增益系数、提取效率等方面对棒状Nd:LuAG陶瓷增益介质进行了研究。; Laser transparent ceramics not only possess the same good optical properties and physicochemical properties as crystals, but also hold the advantages of being easy for large-scale preparation, high-active ion doping concentration, good material uniformity, short production period, and low cost. Compared with glass, transparent ceramics have the advantages of high thermal conductivity, high radiation threshold, and better monochromaticity. In summary, laser transparent ceramics have become the promising laser materials after single crystals and glass. The emission cross section of Nd:LuAG(Nd:Lu3Al5O12) is small, and it has a long fluorescence lifetime and relatively high thermal conductivity. As a cubic crystal system, Nd:LuAG can be processed into polycrystalline ceramics, which can produce large-aperture laser ceramics at a low cost. Comprehensively considering the material properties and processing costs, Nd:LuAG transparent ceramics are definitely promising materials. It’s easy to say that Nd:LuAG transparent ceramics are effective material for high-power and large-energy lasers in the future.Compared with traditional transmit slab amplifiers, the active mirror slab amplifier can achieve double amplification in single pass. The extraction efficiency is high, and the surface thermal deposition could be cooled by directly contacting with the fluid, solving the laser gain medium thermal effects effectively. Based on these analysis, this paper focuses on the active mirror slab transparent ceramic amplifier, mainly studies the performance of the transparent ceramic amplifier from the thermal distortion and energy storage. An experiment for active mirror slab amplifier was set up. The structure included signal seed section, preamplifier and main amplifier. The main amplifier was an active mirror slab configuration. The thermal effect of the large-scale active mirror slab Nd:LuAG ceramic laser gain medium under high power diode pumping conditions and its wavefront distortion were analyzed, consequently transparent ceramic energy storage and thermal distortion were experimentally studied. Taking the widely studied Nd:LuAG transparent ceramics and Nd:YAG (Nd:Y3Al5O12) crystals as research objects, Monte Carlo method was used to simulate and analyze the amplified spontaneous emission (ASE) in the slab amplifiers, The influences of cladding around a circular Nd:LuAG ceramic slab and the influences of different solution around the edge of a rectangular Nd:YAG crystal slab on energy storage were analyzed. At the same time, energy amplification experiments were carried out on a rectangular Nd:YAG crystal. A laser amplification experiment of fiber end-pumped rod Nd:LuAG ceramic was developed. The single-pass and double-pass amplification experiments were performed under the same front-end Q-switched pulse signal light injection and the same pumping conditions. Optical properties of the rod Nd:LuAG ceramic were studied in terms of small signal gain coefficient and extraction efficiency. |
| 学科主题 | 光学工程 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/31047]  |
| 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 | 刘秋菊. 有源反射镜式片状放大器的仿真分析和实验研究[D]. |
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