单纵模掺铒光纤激光器的设计及应用研究

发布时间：2018-05-21 13:04

本文选题：光纤激光器 + 单纵模　；参考：《华北电力大学》2017年硕士论文

【摘要】：光纤激光器作为第三代激光器的代表,具有体积小、重量轻、功率高、噪声低、等优良特性,但是,随着科学的发展,许多领域比如长距离分布式温度、应变等传感、光通信、频率锁定等都对光纤激光器有了更高的要求,而单纵模光纤激光器因其超窄带宽的激光输出,较高的输出功率逐渐受到科研工作者的重视。本文基于上述背景设计了一种新型单纵模掺铒光纤激光器,利用双环型腔与作为饱和吸收体的未泵浦光纤相结合的方式来进行激光纵模的选择。在分析光纤激光器的构成、原理的基础上,利用光学仿真软件Optisystem对该激光器进行仿真研究。其次,搭建了单纵模掺铒光纤激光器系统,并进行了输出功率、阈值等参数的测量。最后,利用光纤激光器的传感特性,提出并设计了基于单纵模光纤激光器变压器绕组监测系统。本文主要做了以下几个方面的研究工作:分析了掺铒光纤激光器的工作原理;在仿真软件上搭建新型结构激光器系统,研究了多环形腔,饱和吸收体对于激光输出功率、阈值等参数的影响。并从饱和吸收体长度,耦合器耦合比等方面对激光器进行参数优化;利用仿真得到的各类数据,搭建单纵模光纤激光器实验系统,实现激光的输出,测量了输出激光的功率、阈值等参数并与仿真数值进行了比较分析;基于光纤激光器高灵敏度的传感特性,提出了将新型结构的单纵模掺铒光纤激光器应用于变压器绕组温度监测,并从变压器绕组温度监测原理、光纤激光器传感特性等方面验证了该方法的可行性,最后设计了基于单纵模光纤激光器的绕组温度监测系统。
[Abstract]:Fiber laser, as the representative of the third generation laser, has the advantages of small volume, light weight, high power, low noise, and so on. However, with the development of science, many fields such as long-distance distributed temperature, strain sensor, optical communication, etc. Frequency locking has higher requirements for fiber lasers, while single-longitudinal-mode fiber lasers have attracted more and more attention because of their ultra-narrow bandwidth output and high output power. Based on the above background, a novel single-longitudinal mode erbium-doped fiber laser is designed in this paper. The dual ring cavity is combined with the unpumped fiber as a saturated absorber to select the longitudinal mode of the laser. On the basis of analyzing the constitution and principle of fiber laser, the simulation research of the laser is carried out by using the optical simulation software Optisystem. Secondly, a single longitudinal mode erbium-doped fiber laser system is built, and the output power, threshold and other parameters are measured. Finally, based on the sensing characteristics of fiber laser, a transformer winding monitoring system based on single longitudinal mode fiber laser is proposed and designed. The main work of this paper is as follows: the working principle of erbium-doped fiber laser is analyzed, a new structure laser system is built on the simulation software, and the output power of multi-ring cavity and saturated absorber for laser is studied. The effect of threshold and other parameters. The parameters of the laser are optimized from the aspects of saturated absorber length, coupler coupling ratio and so on. The experiment system of single-longitudinal mode fiber laser is built by using all kinds of simulation data, the output of the laser is realized, and the output power of the laser is measured. Based on the high sensitivity sensing characteristics of fiber laser, a novel single longitudinal mode erbium-doped fiber laser is proposed for transformer winding temperature monitoring. The feasibility of the method is verified from the principle of transformer winding temperature monitoring and the sensing characteristics of fiber laser. Finally, a single longitudinal mode fiber laser based winding temperature monitoring system is designed.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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