外腔光纤激光器的特性及相关测距研究

发布时间：2018-03-22 02:20

本文选题：外腔反馈　切入点：光纤激光器　出处：《安徽大学》2015年硕士论文　论文类型：学位论文

【摘要】：激光器自20世纪60年代诞生以来,已经经历了五十多年的发展。随着现代光电子技术、光纤通信技术以及传感技术的快速发展,不同种类的激光器已广泛应用于工农业生产、航空航天、国防军事、医疗卫生和科学研究等各个领域,与人们的生活息息相关。本文将外腔反馈技术与光纤激光器相结合,研究了外腔反馈对光纤激光器阈值功率、激光线宽和稳定性等特性的影响,同时开展了基于激光自混合效应的相关测距传感研究。本文主要的研究工作有：1. 基于激光器速率方程和稳态方程对外腔光纤激光器的工作原理进行了理论推导,并仿真模拟了外腔反馈对激光器输出特性的影响,搭建了外腔光纤激光器试验系统并完成了相关的研究工作。2. 将外腔反馈引入到可调谐光纤激光器中,并成功搭建基于外腔反馈可调谐光纤激光器系统,展开了外腔反馈对激光器阈值功率、激光线宽和稳定性等特性影响的研究。3. 结合自混合技术及波长调谐技术,分别建立了基于半导体激光器和光纤激光器的测距传感模型并进行了仿真模拟,分别搭建了半导体激光器和光纤激光器自混合测距系统,展开了基于半导体激光器和线形腔光纤激光器自混合测距研究。实验结果表明半导体激光器的测距范围为4cm-60cm,测量精度在5mm以内,并对测量误差进行了相应的分析。本论文的创新点主要包括：1.建立外腔反馈光纤激光器系统物理模型,并基于该模型仿真模拟了外腔反馈对光纤激光器及可调谐光纤激光器阈值功率、激光线宽和稳定性等输出特性的影响,为后续的实验研究和应用奠定了理论基础。2.搭建了外腔反馈光纤激光器及可调谐光纤激光器系统,并展开了外腔反馈对激光器输出特性影响的研究,并实现了阈值功率从29.24mW降低到24.02mW,线宽从21.4kHz压窄到17.2kHz：可调谐光纤激光器的调谐范围大约15nm,边模抑制比大于66dB,线宽从20.4kHz压窄到7.3kHz。3.建立了基于光纤激光器的测距传感模型,分别搭建了半导体激光器和光纤激光器自混合测距系统并展开了相关研究,为进一步研究光纤激光器的传感应用奠定了基础。
[Abstract]:Laser has been developed for more than 50 years since it was born in 1960s. With the rapid development of modern optoelectronic technology, optical fiber communication technology and sensing technology, different kinds of lasers have been widely used in industrial and agricultural production. Aerospace, national defense, military, medical and health, and scientific research are closely related to people's lives. In this paper, the threshold power of external cavity feedback to fiber laser is studied by combining external cavity feedback technology with fiber laser. The effects of laser linewidth and stability, At the same time, the related ranging sensing research based on laser self-mixing effect is carried out. The main research work in this paper is: 1. The working principle of external cavity fiber laser based on laser rate equation and steady-state equation is deduced theoretically. The effect of external cavity feedback on the output characteristics of the laser is simulated and the experimental system of the external cavity fiber laser is built and the related research work is completed. 2. The external cavity feedback is introduced into the tunable fiber laser. A tunable fiber laser system based on external cavity feedback is successfully built. The effects of external cavity feedback on the threshold power, laser linewidth and stability of the laser are studied. The ranging sensing models based on semiconductor laser and fiber laser are established and simulated, and the self-mixing ranging system of semiconductor laser and fiber laser is built, respectively. The self-mixing ranging research based on semiconductor laser and linear cavity fiber laser is carried out. The experimental results show that the ranging range of semiconductor laser is 4cm-60 cm, and the measurement accuracy is within 5mm. And the measurement error is analyzed accordingly. The innovation of this paper mainly includes: 1. The physical model of external cavity feedback fiber laser system is established. Based on the model, the effects of external cavity feedback on the output characteristics of fiber laser and tunable fiber laser, such as threshold power, laser linewidth and stability, are simulated and simulated. 2. The external cavity feedback fiber laser and tunable fiber laser system are built, and the effects of external cavity feedback on the output characteristics of the laser are studied. The threshold power is reduced from 29.24mW to 24.02 MW, the linewidth is narrowed from 21.4kHz to 17.2 kHz: the tuning range of tunable fiber laser is about 15nm, the edge-mode rejection ratio is greater than 66dB, the linewidth is narrowed from 20.4kHz voltage to 7.3kHz. 3. The ranging sensing model based on fiber laser is established. The self-mixing ranging system of semiconductor laser and fiber laser is built and the related research is carried out, which lays a foundation for further research on the sensing application of fiber laser.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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