【作者】 郭颖；

【导师】 郑义；

【作者基本信息】 郑州大学 ， 物理电子学， 2010， 硕士

【摘要】 掺Yb3+双包层光纤激光器以其成本低、阈值低、窄带宽、易于制作、效率高、可协调、紧凑小巧和高性价比等优点,近年来备受关注。在通信、传感、工业、军事、光信息处理、医疗等领域都有了广泛的应用。本文从理论和实验两个方面对掺镱DCFL系统性能进行分析。其主要研究内容如下：1.本文简单介绍了DCFL的特点和种类,并从性能上探讨了研究进展和应用前景。最后简述了本文的主要研究内容。2.根据掺镱DCFL系统的基本组成和工作原理,分别介绍了掺Yb3+光纤能级结构、光谱特性和受激辐射等性能；介绍了双包层光纤结构和内包层结构的吸收效率问题；另外,介绍了几种包层泵浦技术和谐振腔技术,这些都是DCFL系统中的关键技术；根据Yb3+离子稳态速率方程和泵浦光、激光在双包层光纤中前后传输方程,利用了简化的理论模型,推出了DCFL输出特性和激光腔参数关系表达式。并利用了Matlab数值模拟分析了激光与泵浦光的功率分布,分析了腔镜(光透过率)、泵浦波长、斜效率、阈值、增益介质长度对激光输出的影响。为实验优化提供了理论依据。3.简单介绍了实验所需要的仪器设备包括增益介质、泵浦源装置、谐振腔、泵浦耦合系统等。重点介绍了端面处理实验流程,本文从手工研磨和机器研磨两个方面展开讨论,分别经过各自不同的研磨流程,抛光完成后利用视频放大仪和连接器端面干涉检查仪分析几何结构,并通过测试透过率检验端面研磨效果。4.介绍了光纤激光器频率稳定性和功率稳定性概念以及影响因素,利用功率计和光谱仪等设备测量两者稳定度。两者稳定度的计算方法都是用标准差来描述的。更多还原

【Abstract】 In recent years, the Yb3+ doped double-clad fiber laser is widely concerned because of its low-cost, low-threshold, narrow bandwidth, easy-to-production, high efficiency, can be coordinated, compact and cost-effective advantages. The double-clad fiber has a large range of applications in communication, sensing, industrial, military, and optical information processing, medical and other fields. Now, I use both theoretical and experimental aspects of system performance to analysis of Yb3+ doped DCFL.1. This paper briefly describes the characteristics and types of double-clad laser, and from the specific performance to analyze of situation and application prospects. Finally, it describes the main research contents of this paper.2. According to Yb3+ doped double-clad fiber laser system of the basic composition and working principle, this paper introduced the energy levels of Yb3+ ions structure, spectral characteristics and performance such as stimulated emission; and introduced the double-clad fiber structure, the inner cladding structure and the absorption efficiency; in addition, it introduced several cladding pump technology and resonant cavity technology, these are the key technologies in the Yb3+ doped DCFL system; under the laser in the double-clad optical fiber before and after the transfer equation and Yb3+ ions steady-state rate equation pump light, it uses a simplified theoretical model, launched the Yb3+ doped DCFL output characteristics and laser cavity parameters of the relationship between the expression. And it takes advantage of the Matlab numerical simulation of the laser and pump light power distribution, analyzes of endoscopic (optical transmission), pump wavelength, slope efficiency, threshold, the gain medium length of the laser output effects. It provides a theoretical basis for experimental optimization.3. This paper briefly describes the laboratory equipment needed, including the gain medium, resonant cavity pump, source device, pump coupling system, etc. It focused on the end-processing of fiber test flow. In this paper, hand-grinding and polishing machines are on two fronts discussion. Through different polishing processes, we use video amplification instrument and connectors, interference tester face geometry inspection to check grinded geometry, and it test transmission and optical fiber end face grinding results.4. It describes the fiber laser frequency stability and power stability of the concepts and factors, and used power meter and spectrum measured stability. We use standard deviation to describe the both of stability.更多还原