| 题名 | 基于新型PMNT透明陶瓷的高功率电光器件研究 |
| 作者 | 张学娇 |
| 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 | 蔡海文 |
| 关键词 | 高功率电光器件, PMNT电光陶瓷,调Q开关, 偏振无关调制器 |
| 其他题名 | Research on high-power electro-optic devices based on novel transparent PMNT |
| 中文摘要 | 现代材料加工业、军事、空间和医疗等应用领域对高峰值功率、短脉冲、高平均功率的激光光源具有迫切的应用需求。高速、高激光损伤阈值的激光光电器件是提升激光技术水平、发展激光通信和激光雷达等民用和军事应用的关键器件，是各发达国家竞相发展的前沿技术。本文通过跟踪国际高功率电光器件的发展动态，并结合电光陶瓷材料领域的最新研究进展，开展了基于新型铌镁酸铅钛酸铅(PMNT) 电光陶瓷的高功率激光光电器件技术的研究。论文在对PMNT电光陶瓷的电控双折射效应、光散射效应、激光损伤阈值等基本特性进行充分研究的基础上，开展了基于PMNT 电光陶瓷电控双折射效应的高功率调Q电光开关和偏振无关的电光调制器等相关器件技术的研究。建立了器件的理论模型，并进行仿真研究，搭建实验测试平台，对实验测试结果和器件特性等方面进行了详细的分析，获得大量详实的数据，为高功率电光器件的发展提供了很好理论基础与技术支撑。 本文涉及到的具体研究内容如下： 1.利用Fabry-Perot谐振腔的谐振效应，对新型（PMNT）电光陶瓷的不同偏振方向的电光系数进行了测量和表征，获得了详实的实验测量结果，其结果为γ33=21.06×10-16 m2/V2 ，γ31=-1.76×10-16 m2/V2。同时，论文也对这种新型电光陶瓷材料的激光损伤阈值进行了测量。对于基于电光散射效应的PMNT透明陶瓷，我们对其光散射特性、插入损耗和响应速度等特性也进行了详细的测试分析。以上研究为接下来器件的结构设计和特性表征提供参考，也为材料的性能优化提供了理论依据。 2.利用PMNT新型电光陶瓷的电控双折射效应对传输光束偏振方向的调控，构建了一种可应用于高功率激光系统的电光调Q开关，其半波电压为730 V，消光比大于30 dB，通光孔径为2.7 mm，响应速度小于1 μs（可通过改善材料尺寸比例来提高响应速度）。同时对这种高功率调Q光开关进行了小型化设计和封装，获得了器件的实物原型（完成样机开发），推动了器件实用化的进程。 3.针对高功率应用需求，提出并设计了一种基于Sagnac环结构的空间结构高功率新型偏振无关电光调制器。建立相应理论模型，利用Matlab分析了不同分束比以及偏振态对于调制器输出特性的影响。在实验上，我们搭建器件的实验测量装置，对器件性能进行了详细的测试分析，测得器件的消光比为21.6 dB，响应速度可达到180 ns。 |
| 英文摘要 | Applications in modern materials processing industry, military, space and medicine demand urgently for high peak power, short pulse and high average power lasers. Laser optoelectronic devices with high laser induced damage threshold are the key components for raising the level of laser technology, developing laser communication, laser radar and some other civilian and military applications, which are cutting-edge technology well-worth study in the developed countries. Based on the trend in the development of the international high-power electro-optic technology and the recent progress in optoceramic field, the novel electro-optic devices based on the transparent lead magnesium niobate titanate (PMNT) optoceramic are investigated. Electrically-controlled birefringence effect, scattering effect and laser-induced damage threshold of the PMNT are well researched and described in the paper. Then the research on the high power Q switch based on the effect of electro-optical birefringence and the polariztion-independent electro-optic modulator is developed. Theoretical models of the devices are built and related simulations are conducted, while test platform is constructed. Then we provide a detailed analysis of the test results and device properties, specific datas from which sufficiently supports the development of high power electro-optic dveices in theory and technology. The paper contains following parts: 1. A Fabry-Perot resonant technique is introduced to measure the quardratic electro-optic coefficients of PMNT optoceramic with different polarized incident light. The result is γ33=21.06×10-16 m2/V2, γ31=-1.76×10-16 m2/V2. The laser induced threshold of PMNT is also measured meanwhile. Some researches are conducted containing optical properties such as scattering effect, insertion loss and response speed, which provides references to the structure design, electro-optical characterization and the theoretical basis of the performance optimization. 2. An electro-optical Q-switch applied to high power laser system by using the electrically-controlled birefringence effect is proposed. The properties of the Q-switch is studied in detail. The half-wave voltage is 730 V with an extinction ratio of 30 dB, and switching speed is shorter than 1 μs with Ф2.7 mm clear aperture. Meanwhile miniaturization and package of the switch is designed. Then the physical prototype is obtained, which promotes the process of practical application. 3. A novel polarization-independent electro-optic modulator is proposed and investigated of PMNT optoceramic, aiming at the application in high-power laser. The theoretical model is set up. Corresponding analysis of extinction ratio and polarization state versus the output of the modulator are conducted by using MATLAB. We construct an experimental measurement equipment and the performance of the device is detailedly tseted. The modulator deserves a switching speed of 180 ns, and an extinction ratio of 21.6 dB. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16750]  |
| 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 | 张学娇. 基于新型PMNT透明陶瓷的高功率电光器件研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
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