高功率光纤激光线宽调控技术研究
文献类型：学位论文
| 作者 | 刘广柏 |
| 学位类别 | 硕士 |
| 答辩日期 | 2016 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 何兵 |
| 关键词 | 光纤激光器 高功率 窄线宽 SBS 相位调制 |
| 其他题名 | Study on linewidth modulation technology of high power fiber lasers and amplifiers |
| 中文摘要 | 随着半导体激光泵浦技术的发展和双包层光纤技术的不断成熟，高功率光纤激光器成为目前激光技术领域最为活跃的研究方向之一。由于转换效率高、光束质量好、结构紧凑、成本低、稳定性好、热管理方便等一系列优点，光纤激光器在工业制造及加工、光通信、医疗美容、国防军事以及科研等领域都有着重要的应用。但是由于介质的非线性效应、光纤端面损伤和热致光致损伤等一系列物理因素的限制，单根光纤激光器的输出功率存在着理论极限，功率的进一步提升变得极其困难。基于光纤激光阵列的合成技术是一种有效突破单纤输出功率极限，同时获得高亮度、高光束质量激光的有效方法。但是合成技术方案对光谱线宽仍然有一定要求，本文主要针对高功率窄线宽光纤放大器进行理论和实验研究，旨在优化单链路光纤放大器的激光线宽，使其能更好地应用于光纤激光合成系统中。 第一章综述了光纤激光器的发展历史、发展趋势，展望了高功率光纤放大器在工业、军事、医疗中等领域的应用前景。介绍了高功率窄线宽光纤放大器种子源技术，包括全光纤窄带主振荡放大自发辐射(ASE MO) 种子源，相位调制展宽种子激光线宽，啁啾种子源，以及双波长种子源等。对窄线宽光纤激光的非线性效应进行了综述，特别是对限制高功率窄线宽放大器进一步提升功率的关键限制因素：受激布里渊散射(SBS)效应进行了讨论。最后综述了高功率窄线宽光纤放大器的研究进展，以及在光纤激光合成技术中的应用， 包括主动相干合成，被动相干合成，基于衍射光学元件的相干合成，光谱合成。 第二章对光纤激光放大过程中SBS效应进行了详细探讨，首先分析了光纤中SBS的产生机理，影响因素。通过SBS阈值方程的推导，对SBS的抑制方法进行了详细研究，并对通过相位调制等方法展宽激光线宽、施加应力梯度、温度场、声场裁剪等SBS抑制方法进行了比较。通过实验对单频全光纤放大器中的SBS 效应进行了实验研究。 第三章对光纤激光器中的放大自发辐射效应进行了理论和实验研究，通过窄带级联滤波原理，搭建了1.5 kW近衍射极限全光纤窄带超荧光光源，详细介绍了实验装置，并对实验结果进行了详细的分析。 第四章研究了高功率GHz相位展宽技术，通过理论模拟与实验验证相结合，探讨了利用白噪声源调制展宽种子激光线宽技术， 获得了高功率窄线宽激光输出。 第五章详细介绍了高功率窄线宽放大器的系统结构，研究了高功率窄线宽光纤放大器的整机化装配技术，并实现了放大器模块化和整机化。 |
| 英文摘要 | As the development of laser diode pump technology and double cladding fiber, high power fiber laser has been one of the most active research directions in the field of laser technology recently. Due to the advantages of compactness, well stability, convenient heat management, high conversion efficiency, excellent beam quality, etc, high power fiber lasers have wide applications in industrial processing, medical treatment, national defense, scientific research and so on. Nevertheless, restricted by nonlinear effects, fiber damage, optical or thermal damage, a single fiber laser has its ultimate power. The beam combining technology based on fiber array has been proved to be effective method to overcome the limited power of single fiber laser and maintain good beam quality. Meanwhile, beam combining technology still has requirement in the linewidth of the input beams. In this paper, theoretical and experimental research of high power narrow linewidth fiber amplifiers has been described in detail. Optimizing the linewidth of single fiber amplifier to make it best for application in beam combining system is the emphasis in the paper. In the first chapter, the development history , latest progress and the development tendency of fiber lasers are reviewed, and the application prospect in industrial processing, national defense, medical treatment of high power fiber amplifiers are predicated. The seed lasers for high power narrow linewidth fiber amplifiers are also introduced in this chapter, including all fiber narrow linewidth master oscillator amplified spontaneous radiation seed lasers, broadening linewidth of seed lasers by phase modulation, chirp seed sources, and dual-wavelength seed lasers. Nonlinear effect expressly the stimulated Brillouin scattering (SBS) which is the key limitation for further enhancement of narrow linewidth fiber lasers output power are studied. At last, the development of high power narrow linewidth fiber amplifiers are reviewed, and the application in beam combining technology are introduced, including active coherent beam combining (CBC), passive CBC, CBC based on diffractive optical elements, and SBC. In the second chapter, SBS in fiber amplifier is studied in detail. Firstly, the mechanism of production and influencing factors of SBS in fiber is analyzed. By deriving the threshold equations of SBS, the suppression methods for SBS are well discussed. Methods of broadening linewidth of seed lasers by phase modulation, applying stress gradient, temperature distribution, acoustic field cutting are compared to suppress SBS. And the SBS in single frequency fiber amplifier is experimentally studied. In the third chapter, the ASE effect is experimentally studied. Based on narrowband cascade filtering method, 1.5 kW near-diffraction-limited narrowband all-fiber superfluorescent source is established, the experimental setup is well described, and the experimental results are analyzed is detail. In the fourth chapter, high power GHz phase broadening technology is well studied. By theoretical simulation and experimental validation, white noise phase modulation to broaden the linewidth of the lasers is discussed, and high power narrow linewidth fiber amplifier is achieved. In the fifth chapter, system organization of high power narrow linewidth fiber amplifier is introduced in detail. The master-oscillator power amplifier (MOPA) system is studied, and system assembly are also completed. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/17005]  |
| 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 | 刘广柏. 高功率光纤激光线宽调控技术研究[D]. 中国科学院上海光学精密机械研究所. 2016. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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