快速可调谐掺镱光纤激光器的研究

发布时间：2018-01-10 13:36

本文关键词：快速可调谐掺镱光纤激光器的研究　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：光纤激光器具有光束质量好、集成化程度高及维护方便等优点,可调谐光纤激光器在测量、通信及检测等领域具有良好的应用前景。掺Yb~(3+)光纤具有很宽的荧光光谱(975nm~1200nm),理论上可以实现较大调谐范围的激光输出。本文利用掺Yb~(3+)光纤的宽荧光光谱特性和电光滤波器(EOTF)快速时间响应特性,设计了快速调谐掺Yb~(3+)光纤激光器并进行实验,对激光器快速调谐时间响应、调谐激光输出、激光器功率及脉冲特性等参量进行了理论模拟分析和实验研究,实现了激光器多波长激光的快速调谐输出,平均输出功率14.8mW。具体内容如下:(1)综合讨论了可调谐光纤激光器在光束质量及维护等方面的优点和良好应用前景。从掺Yb~(3+)光纤、泵浦耦合方式、谐振腔设计和调谐技术等各方面分析了可调谐光纤激光器的关键技术,为快速可调谐光纤激光器设计提供理论基础。(2)分析了掺Yb~(3+)光纤激光器的能级结构、吸收和荧光光谱特性,结合EOTF的滤波及动态响应特性建立了快速调谐光纤激光器速率方程理论模型,对激光器快速调谐的动态特性进行数值模拟。模拟结果表明激光器振荡激光波长转换需要上百纳秒的渡越时间,转换时间特性受泵浦功率、波长差及滤波器件参数等因素综合影响。(3)在理论模拟分析基础上,利用EOTF设计环形腔快速调谐光纤激光器并进行实验。实验中对激光器自发辐射谱、输出功率、调谐激光输出等参数进行了测试,在1052nm~1073nm内得到系列波长激光快速调谐输出,平均输出功率14.8mW。本文采用电光滤波器设计了快速调谐掺Yb~(3+)环形腔光纤激光器并进了理论和实验研究,为实现快速调谐光纤激光器的开发提供指导,对检测领域激光光源的发展特别是瞬态信号检测激光光源的发展具有重要意义。
[Abstract]:Fiber laser has the advantages of good beam quality, high degree of integration and easy maintenance. Tunable fiber laser is in measurement. Yb~(3 doped fiber has a wide fluorescence spectrum of 975 nm ~ (1 200 nm). Laser output with a large tuning range can be achieved theoretically. In this paper, the characteristics of wide fluorescence spectrum of Yb~(3 doped fiber and fast time response of electro optic filter (EOTF) are used. The fast tuning Yb~(3 doped fiber laser is designed and experimented. The fast tuning time response and tuning laser output are obtained. The parameters such as laser power and pulse characteristics are analyzed theoretically and experimentally. The fast tuning output of multi-wavelength laser is realized. The average output power is 14.8mW.The detailed contents are as follows: 1) the advantages and good application prospects of tunable fiber laser in beam quality and maintenance are discussed. Yb~(3 doped fiber is introduced. The key technologies of tunable fiber laser are analyzed in terms of pump coupling mode, cavity design and tuning technology. The energy level structure, absorption and fluorescence spectra of Yb~(3 doped fiber laser are analyzed. Based on the filtering and dynamic response characteristics of EOTF, a theoretical model of fast tuning fiber laser rate equation is established. The simulation results show that the wavelength conversion of laser oscillation requires hundreds of nanosecond transition time and the conversion time characteristic is pumped power. On the basis of theoretical simulation and analysis, the influence of wavelength difference and filter parameters is comprehensive. Using EOTF to design a fast tuning fiber laser with ring cavity, the spontaneous emission spectrum, output power and tunable laser output parameters of the laser are measured in the experiment. A series of fast tunable wavelength laser output is obtained at 1073 nm in 1052 nm. The average output power is 14.8 MW. In this paper, a fast tuning Yb~(3 doped fiber laser with Yb~(3 is designed and studied theoretically and experimentally. In order to realize the development of fast tuning fiber laser, it is of great significance to the development of laser light source in the field of detection, especially the development of transient signal detection laser light source.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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