Yb:YAG平面波导放大器研究
文献类型：学位论文
| 作者 | 谢银 |
| 学位类别 | 硕士 |
| 答辩日期 | 2015 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 孟俊清 |
| 关键词 | 激光器 平面波导 多程放大 Yb:YAG 侧面泵浦 |
| 其他题名 | Research on Yb:YAG planar waveguide amplifier |
| 中文摘要 | 平面波导提供了一种介于大体积固体激光器和光纤激光器的中间条件，是板条激光器与光纤激光器的良好结合体，综合了块状固体激光和光纤激光的优点，同时又避免了两者的缺点。经典的板条状平面波导结构采用大面积冷却，有利于散热，平面波导激光器通过提供热透镜效应的一维控制以及通过增加波导增益区的宽度和长度进行功率缩放。与光纤类似的波导结构具有大的数值孔径，可以很好地约束非衍射极限的抽运光，激光亮度极高，不存在非线性效应问题。 本论文对激光二极管侧面泵浦的Yb:YAG平面波导激光器和放大器进行了理论分析和实验研究。根据Degnan和Hall提出的理论，采用射线光学和波动理论分析了平面波导内模式的传播，得出了三种低损耗的波导耦合条件。文中设计了一个采用第一种低损耗耦合条件（Case I）的平凹波导谐振腔，得到了13.8W的激光输出，斜率效率为35%；研究了输出耦合镜透过率和后腔镜位置对激光器输出性能的影响。在此基础上，对平面波导放大器进行了研究，设计了一个基于第三种低损耗耦合条件（CaseⅢ）的多程放大器，在400W峰值功率的泵浦下得到了单脉冲能量670μJ的激光输出，Mx2＜1.3、My2＜1.6；研究讨论了放大器的放大性能和小信号增益。论文最后又利用Nd:YVO4搭建了一个峰功＞2MW的纳秒级MOPA结构激光器。 |
| 英文摘要 | The planar waveguide laser offers an intermediate case between bulk solid-state lasers and fiber lasers, the combination of slab laser and fiber laser. It combines the advantages of bulk solid-state lasers and fiber laser, while avoiding the disadvantages of them. Cooling of the typical waveguide structure can be achieved through the use of direct contacting of water cooled heat sinks to the largest surfaces. Thermal lensing effects are controlled through one-dimensional heat flow from the active region, whilst power scaling can be obtained by increasing the width and length of the active-region. The non-diffraction-limited pumping light can be well constrained by the waveguide with a large numerical aperture (NA) as same as fiber. We can get high brightness laser without nonlinear effects. In this paper, the laser diode side-pumped Yb: YAG planar waveguide lasers and amplifiers are analyzed theoretically and experimentally. According to the theory proposed by Degnan and Hall, we obtained three low loss waveguide coupling conditions. A simple plano-concave resonator has been developed to combine a weakly confined stable resonator in the lateral direction and a dual case I waveguide resonator in the transverse direction. The output power was 13.8W with the slope efficiency of 35%. We study the effect of output laser performance for different transmission of output coupling mirror and separation of rear mirror. Then, we designed a multi-pass amplifier based on the third low loss coupling condition (Case Ⅲ). We get energy of 670uJ output with 400W peak power pump , Mx2＜1.3, My2＜1.6. At same time, we study the amplification performance and small signal gain of the amplifier. At last ,we build one peak power＞2MW nanosecond MOPA laser based on Nd: YVO4. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16887]  |
| 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 | 谢银. Yb:YAG平面波导放大器研究[D]. 中国科学院上海光学精密机械研究所. 2015. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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