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题名	掺镱光纤放大器及特高频固体激光脉冲放大的研究
作者	刘雁
学位类别	博士
答辩日期	2007
授予单位	中国科学院上海光学精密机械研究所
导师	陆雨田
关键词	高频脉冲列 掺镱双包层光纤 光纤放大器 超荧光光源
其他题名	Research of ytterbium-doped fiber amplifier and the application to ultrahigh repetition rate pluses of Solid-State laser
中文摘要	掺镱光纤放大器的研究是光纤激光器件的一个热点。光纤放大器由于结构紧凑、散热性能好、体积小、重量轻、光束质量好等优点而受到广泛的关注。在掺杂光纤放大器中，掺镱光纤放大器由于增益谱宽、效率高、没有其他掺杂离子的激发态吸收等特性，掺杂浓度也可以很高，用较短的长度就可以实现较大的增益，所以在大功率放大方面的应用越来越得到人们的重视。掺镱光纤放大器在激光通讯、军事、医疗、工业上有着广泛的应用前景。 第一章综述了光纤放大器在激光通讯、工业、医疗、军事上的应用。分析了几种主要的掺稀土光纤放大器的光谱特性和增益特点。论述了不同类型光放大器的特点。分析了光纤放大器的发展方向，并且就宽带光纤放大器的研究现状和发展趋势进行了分析。 第二章 论述了掺镱光纤放大器的基本特点。论述了镱离子的能级特点，并且介绍了掺镱光纤放大系统中所需要的一些光学器件和基本概念。接着对光纤放大器的泵浦方式，特别是侧面泵浦和端面泵浦进行了详细的描述。最后基于标准的两能级结构，给出了在脉冲条件和连续条件下，掺镱光纤放大器的速率和传输方程，并给出了在特殊情况下方程的解析解。 第三章 主要对掺镱光纤放大器进行了理论方面的研究。第一节分析了910nm和975nm双波长泵浦的时候，掺镱光纤放大器的增益和传输特点，并和单波长泵浦的情况进行了比较。第二节分析了信号光的双程放大特性，并且进行了优化。第三节提出了信号光的四程放大的掺镱光纤放大器的结构，并且和单程放大进行了比较，发现在获得同样的增益的条件下，四程放大所用光纤的长度远远小于单程放大。另外最大的输出功率要远大于单程放大。第四节讨论了两段光纤级连、信号光双程放大的时候，光纤放大器的增益和传输特点，并且在不同情况对放大器进行了优化。 第四章对双包层掺镱光纤放大器进行了实验研究。比较了掺镱光纤和掺钕光纤对1064nm的放大特性。详细的论述了信号光耦合效率测量的方法，借助于Zemax软件，设计了泵浦光的耦合系统。接着研究了在940nmLD反向泵浦下，掺镱光纤对1064nm的连续光进行了放大特性。最后研究了掺镱光纤放大器对320兆赫兹的特高频脉冲列的放大. 第五章讨论了掺镱光纤的超荧光光源。首先论述了光纤超荧光光源的结构和特点，并且对它进行了理论分析。接着从实验的角度研究了1.7米掺镱光纤的后向超荧光光源的特点、9米左右掺镱光纤的前后向超荧光光源的特点。指出了短光纤和长光纤的超荧光可以合成为宽带宽的超荧光光源。
英文摘要	The research of ytterbium-doped fiber amplifier is active in fiber laser fields recently. The fiber amplifiers have some advantages over the bulk solid-lasers and amplifiers, including compact size, outstanding thermo-optical properties, little volume, light weight and good quality of laser beam. So the rare-earth doped fiber amplifier has attracted great interest now. In all rare-doped fiber amplifiers, the ytterbium-doped fiber amplifiers have very broad gain spectrum range, high efficiency without the excited state absorption in other rare-earth doped fiber, high doped concentration that lead to get high gain only with a short length of fiber. These advantages make ytterbium-doped fiber welcome in high power laser fields. Now the ytterbium-doped fiber lasers and amplifiers have demonstrated a most attractive foreground in laser communication, military affairs, medicine and industry. In the first chapter, the application of fiber amplifiers in laser communications, industry, medicine and military affairs were demonstrated . The secondly, the gain and spectrum characteristics of the other rare-doped fiber amplifiers were discussed. The advantages and disadvantages of different optical amplifiers were analyzed. At last , the development direction of fiber amplifier was described . In specially, the current status and future prospects of the wide band fiber amplifiers were summarized. In the second chapter, the fundamental characteristics of ytterbium-doped fiber amplifiers were summarized. At first, the level structure of ytterbium ion, the absorption and emission spectrum were analyzed. The optical components and some elementary conception that used in fiber amplifiers system were introduced. The pumping method of fiber amplifier, such as end pumping and side pumping were described in particular. At last, the rate equations and the propagation equations were demonstrated in terms of two-level systems. The analytical expressions for the output pump, signal and ASE power in some particular cases of these equations were summarized. In the third chapter, the ytterbium-doped fiber amplifiers were mainly study in theory. In the first part, the gain and propagation characteristics of ytterbium-doped amplifier at 1064nm by dual-wavelength pumping (910nm and 975nm) were analyzed. In order to compare, the structure of 910nm pumping and 975nm pumping respectively were discussed. In the second part, the gain characteristics of double pass ytterbium-doped fiber amplifier pumped by 915nm was analyzed and compared with the one pass fiber amplifier. The propagation of the pump, the signal and the distribution of the upper level population were demonstrated. The optimization of the double pass fiber amplifier was also discussed. In the three part, the structure of four-passed ytterbium-doped fiber amplifier was put forward. Comparing the one pass fiber amplifier, it was found that, while using a shorter length of the fiber, a four-passed fiber amplifier can realize the same output power as a single-pass fiber amplifier, and, it can offers a significantly higher power than the single-pass counterpart. At last, the gain and propagation trait of two-pass two-stage ytterbium-doped fiber amplifier were analyzed in detail. The optimization of this structure amplifier was also discussed. The experimental study on ytterbium-doped double cladding fiber amplifier was discussed in the fourth chapter. The differences between the Yb- and Nd-doped fibers for amplifying the light of 1064nm were discussed. The measured method of signal coupling efficiency was demonstrated in detail. Based on the optical design software Zemax, the coupling system of pump light was designed. The amplification characteristic of ytterbium-doped double cladding fiber amplifier for 1064nm was also study by experiment when the 940nm LD pumped backward. At last, amplification of the pulses at 320MHz ultrahigh repetition rate by using ytterbium-doped fiber was demonstrated. In the last chapter, the experimental results of ytterbium-doped double-cladding fiber super-fluorescent source pumped by 940nm LD were analyzed. At first, the structures and traits of super-fluorescent fiber source were summarized and the theoretic analysis was also given. The experimental study on backward super-fluorescent source of 1.7m length Yb-doped double cladding fiber and the backward, forward super-fluorescent source of 9 meter length Yb-doped fiber were demonstrated. It demonstrated that broadband super-fluorescent source can consist of the super-fluorescent of a short length fiber and a longer length fiber .
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/15476]
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	刘雁. 掺镱光纤放大器及特高频固体激光脉冲放大的研究[D]. 中国科学院上海光学精密机械研究所. 2007.

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