光纤激光器的泵浦技术研究
文献类型：学位论文
| 作者 | 吴中林 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 楼祺洪 |
| 关键词 | 半导体激光器 双包层光纤 端面泵浦 侧面泵浦 全固化光纤激光器 |
| 中文摘要 | 高功率光纤激光器是目前激光领域最为活跃的研究方向之一，与其他固体激光器相比，光纤激光器因其体积小、重量轻、效率高、结构简单等特点，在工业、医疗、科研、军事等领域以展现出极其诱人的应用前景，受到人们的广泛关注。本文从光纤激光器的端面泵浦、侧面泵浦和全固化光纤激光器的方面对光纤激光器的泵浦技术进行了研究，目的是探索良好的泵浦方法，以提高光纤激光器的各项性能指标。本文首先从理论上对双包层光纤内包层中的泵浦光和纤芯中的激光的传输机理进行了研究，获得了泵浦光在内包层中传输的条件及纤芯中单模激光的实现条件，并对内包层的形状影响掺杂纤芯的吸收情况进行了研究，近似地讨论了D形内包层中泵浦光在纤芯中的吸收情况。本文然后对大功率半导体激光器列阵组的光束整形、滤波、非球面镜聚焦的系统进行了研究，主要在滤波器的设计、滤波小孔的选择及滤波器的调试等几个方面进行了研究，确保聚焦光斑被约束在双包层光纤端面的石英内包层范围之内，采用这套系统首先获得了50．3W的光纤激光输出，这套系统现在仍然应用于单光纤440W级的光纤激光器中。同时研究了在高功率运转的情况下两种保护双包层光纤端面免遭热损伤的方法。其次，本文对采用微棱镜侧面祸合泵浦光的方法进行了研究，并在此基础上研究两种侧面祸合泵浦光的新方法，即D形石英柱体与双包层光纤侧面藕合的方法以及马蹄形棱镜与双包层光纤侧面藕合的方法。这两种侧面藕合泵浦光的方法简单易行，祸合效率都在80％以上。最后，本文对全固化光纤激光技术进行了研究，主要涉及到大芯径多模石英光纤的端面熔接祸合技术、多个不需制冷只需简单风冷的小功率（2W以下）单管半导体激光器非相干组束技术以及全固化光纤激光器的后腔镜的设置方法研究。在光纤熔接方面，实验中探索了一套大芯径多模石英光纤端面熔接祸合的技术，采用电火花放电对直径为200微米的两光纤进行了端面熔接，损耗为0．15dB左右。在后腔镜的设置方面，本文研究了新型光纤光栅端面熔接法和传能光纤端面镀双色膜的方法，并对采用双色膜后腔镜的全固化光纤激光器进行了功能性的激光实验，获得了5．5W的激光输出，光一光转化效率为44％左右。 |
| 英文摘要 | High power fiber laser is one of the most active research direction in laser fields. Comparing with other solid laser, fiber laser has demonstrated a most attractive foreground in industry, medicine, science research military affairs and so on because of its little volume, light weight, high efficiency and simple architecture. It has attracted much more attention. In this thesis, we have researched the pumping technology of fiber laser in end pumping, side pumping and all solid fiber laser. We aim at finding a good method for pumping fiber laser so as to enhancing its performance. Firstly, the transmission of laser in the inner clad and in the core of double-clad fiber was researched theoretically. The conditions of pumping light transmitting in the inner clad and mono-mode fiber laser originated in the core were acquired. The difference in absorption of doped core was researched due to different shape of inner clad. The absorption of doped core in D-shape inner clad was researched approximatively. Secondly, the system of beam reshaping, filtering and the focusing by aspheric lens was researched, mainly in the design of filter, the option of filtering aperture and adjustment of filter. This system ensured that the focused spot was limited in the end surface of inner clad. The 50.3 W output of fiber laser was acquired by using this system. Today this system is applied in the fiber laser system of 440W output. In the meanwhile, the two methods of protecting the end of double-clad fiber from thermal damage were researched. Thirdly, the side coupling method of micro-prism and double-clad fiber was researched. The two new methods, i.e. the coupling method of D-shape quartz column and double-clad fiber and the coupling method of horse-foot prism and double clad fiber, were researched. These two methods were simple and their coupling efficiencies were all above 80%. Finally, the technology of all-solid fiber laser was researched in this paper. It included the end melting coupling of big diameter multimode quartz fibers, the non-coherent beam combination of little power LD and the setting of back mirror in all-solid fiber laser. In the end melting coupling of 200um diameter fiber, the loss of the joint was under 0.15dB. The back cavity mirrors of a new FBG and transmitting fiber end filming were researched. The all-solid fiber laser using bichromatic film back cavity mirror was experimented and acquired fiber laser output of 5.5W. Its efficiency of opto-opto transformation was about 44%. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15473]  |
| 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 | 吴中林. 光纤激光器的泵浦技术研究[D]. 中国科学院上海光学精密机械研究所. 2005. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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