声光调Q脉冲掺铥光纤激光器及放大器的研究
文献类型：学位论文
| 作者 | 黄启杰 |
| 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 | 祖继锋 |
| 关键词 | 2微米 声光调Q 掺铥光纤激光器 窄谱宽 ASE |
| 其他题名 | Research on Acousto-optic Q-switched Tm-doped Fiber Laser and Amplifier |
| 中文摘要 | 掺铥双包层光纤激光器输出的2μm波段的激光处于人眼安全和大气窗口的特殊波段，在激光手术、空间光通信、遥感、激光雷达等领域有着重要应用。本论文在大量文献调研的基础上，从理论和实验两个方面对掺铥双包层光纤、声光调Q掺铥光纤激光器和放大器进行了深入研究。 第一部分重点评述了掺铥光纤激光器的技术路线和指标、国内外最新进展及应用领域。 第二部分根据铥离子的能级结构及光谱特性，结合掺铥双包层光纤放大器的特点，采用有限差分法建立了相应的数值分析模型，比较系统地研究了连续运转的掺铥光纤放大器中，种子光波长、种子光功率、泵浦光功率、增益光纤长度、光纤端面的反射率等因素对放大器特性的影响，此外模拟数值研究了脉冲信号光经过放大器后的放大与波形畸变特性。该工作对掺铥光纤放大器的设计、优化与研制具有一定的参考价值。 第三部分采用声光调Q激光技术，在实验上重点研究了两种不同结构的声光调Q掺铥双包层光纤激光器的输出特性。其一，使用前向泵浦结构及高掺杂短光纤，在5kHz重复频率下，获得了脉冲宽度29ns，单脉冲能量188μJ，峰值功率6.5kW的脉冲输出；其二，使用后向泵浦结构改善了输出功率稳定性，利用光纤布拉格光栅作为谐振腔反馈器件，对输出光谱进行了选频，得到了线宽约为0.1nm，平均功率大于2W的窄谱宽脉冲激光输出。 第四部分采用前面研制的窄谱宽声光调Q掺铥光纤激光器作为种子源，使用大模场掺铥保偏双包层光纤作为增益介质，开展了掺铥双包层光纤放大器的设计与实验研究，初步的实验结果获得了平均输出功率5W的脉冲放大输出，输出光谱没有明显的ASE现象。 第五部分简要地总结了本人硕士研究工作期间，截至目前为止所取得的阶段性的研究成果，阐述了论文工作的创新点，并针对存在的问题提出了一些解决方案和技术改进思路，为未来如何进一步提高脉冲掺铥光纤激光器的输出性能给出了初步的总体设计考虑和技术发展展望。 |
| 英文摘要 | The 2μm laser emitted by Tm-doped double-clad fiber laser is eye-safe and in the atmospheric window, which has an important application in the field of laser surgery, space optical communication, remote sensing and laser radar. In this thesis, on the basis of extensive reference research, acoustic-optic Q-switched Tm-doped fiber laser and amplifier are studied from both theoretical and experimental aspects. In section one, key technology route progress and the latest development of pulsed Tm-doped fiber laser are reviewed. In section two, based on the energy level structure and spectral characteristic of thulium ion, a typical Tm-doped double-clad fiber amplifier modeling is comprehensively analyzed through the finite-difference method. The impacting factors such as wavelength and power of the seed, fiber length, pumping power and fiber facet reflectivity are discussed. The amplification and waveform distortion characteristics of the signal pulse after Tm-doped amplifier are also studied. The theoretical models and simulation results have a certain reference value for the design, optimizing and development of Tm-doped fiber amplifiers. In section three, based on acousto-optic Q-switch technology, the characteristic of pulsed Tm-doped fiber laser with two different structures is studied. Firstly, by using a short but highly doped Tm fiber and forward pumping structure, 29ns short pulse with up to 6.5kW peak power and 188µJ pulse energy is obtained at 5kHz repetition rate. Secondly, approximately 0.1nm linewidth pulse with above 2W average output power is derived by using a fiber Bragg grating as an output coupler, while the output power stability is improved by employing the backward pumping structure. In section four, using the previously obtained narrow linewidth Q-switched fiber laser as the seed and Tm-doped large mode polarization maintained double-clad fiber as the gain medium, a master oscillator power amplifier is realized. Preliminary experimental result indicates that about 5W average power with no obvious ASE pulsed output is achieved. In section five, the main works and so far obtained results during my master research are summarized, the innovation points are presented, some personal ideas and solutions for the unsolved problems are suggested. Preliminary overall design consideration and technological development outlook of how to improve the pulse Tm-doped fiber laser output performance are given. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16748]  |
| 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 | 黄启杰. 声光调Q脉冲掺铥光纤激光器及放大器的研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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