外腔半导体激光器论文：光栅外腔半导体激光器的输出特性研究

1、 外腔半导体激光器论文：光栅外腔半导体激光器的输出特性研究【中文摘要】由于外腔半导体激光器(ECSL)的输出激光具有窄线宽、可调谐、频率稳定等突出优点,因而在高分辨率光谱分析、光纤通信、计量检测、生物医学诊断等领域有着广泛的应用前景。本文以光栅外腔半导体激光器为研究对象,首先介绍了外腔半导体激光器的发展状况和应用前景。然后在对半导体激光器和闪耀光栅全面分析的基础上,从强反馈条件下外腔半导体激光器的速率方程出发,对外腔半导体激光器的振荡特性、选模、功率输出、线宽压窄和波长调谐特性进行了分析,并利用Matlab软件和Origin软件对影响Littrow型光栅外腔半导体激光器输出功率和线宽压窄的各种

2、因素进行了数值模拟分析。在理论分析和数值仿真的基础上,研制了单纵模高质量激光输出的光栅外腔半导体激光器,连续输出功率达到180mW(工作电流为400mA),阈值电流由原来的165mA降至118mA。最后用各种方法对实验搭建的光栅外腔半导体激光器的输出特性进行了测试。并重点介绍了线宽的测量方法,最终使用零拍法测得激光器的光谱线宽为20KHz,激光器可以连续输出工作稳定度的激光。【英文摘要】Due to the excellent characteristics of narrow line-width, tunable, frequency stability etc. the external

3、-cavity semiconductor lasers (ECSL) have been widely used in the fields of high-resolution spectrum analysis, optical fiber communication, measuring and testing biomedical medicine etc.In this thesis. the grating external-cavity semiconductor lasers are made as the research objects. First, the devel

4、opment and the applications of the external-cavity semiconductor lasers are introduced. Then, based on the comprehensive analysis of semiconductor lasers and blazed grating, and started from the rate equation of the external cavity under the condition of a strong feedback. the oscillations of the gr

5、ating external-cavity semiconductor lasers are analyzed. At the same time. the characteristics of mode selection, power output, line-width reduction and wavelength tuning are studied. In addition, different factors which are influenced by the output power and line-width reduction of the Littrow exte

6、rnal-cavity semiconductor lasers have been numerical simulated with Matlab software and Origin software. Moreover, based on the theoretical analysis and numerical simulation, the grating external-cavity semiconductor laser which has single longitudinal mode and highly-equality laser output is develo

7、ped. When the continual output power reach 180mW at working current with 400mA, the threshold current will decline from 165mA to 118mA. Finally, the Output Characteristics of grating external-cavity semiconductor lasers are measured with all kinds of methods. At the same time, the line width measure

8、ment methods are emphasized in this thesis. When we use homodyne method, the spectral line-width of ECSL is 20 KHz. Therefore, Lasers which have working stability can be continuously exported.【关键词】外腔半导体激光器 闪耀光栅 输出功率 线宽压窄 数值模拟【英文关键词】External-cavity diode laser blazed grating Output power Line-width r

9、eduction Numerical simulation【目录】光栅外腔半导体激光器的输出特性研究摘要4-5ABSTRACT5第一章 绪论8-121.1 引言81.2 外腔半导体激光器的发展和研究现状8-91.3 外腔半导体激光器的应用9-111.3.1 相干光通信系统9-101.3.2 光纤通信波分复用技术101.3.3 干涉测量技术10-111.4 课题的主要工作和内容安排11-12第二章 基础知识12-272.1 半导体激光器12-222.1.1 半导体激光器简介12-142.1.2 半导体激光器性能分析14-182.1.3 半导体激光器的模式振荡理论18-222.2 闪耀光栅22-2

10、62.2.1 闪耀光栅原理22-242.2.2 闪耀光栅的衍射效率24-262.3 光栅外腔半导体激光器262.4 本章小结26-27第三章 外腔半导体激光器性能分析及数值模拟27-393.1 外腔半导体激光器的振荡特性27-293.1.1 速率方程27-283.1.2 外腔作用下的稳态振荡条件28-293.2 选模29-303.3 功率输出30-323.4 线宽压窄32-353.5 外腔半导体激光器的波长调谐35-383.5.1 温度调谐特性35-363.5.2 电流调谐特性363.5.3 机械调谐特性36-383.6 本章小结38-39第四章 光栅外腔半导体激光器的实验研究39-444.1

11、 器件选择39-404.1.1 激光二极管394.1.2 准直透镜39-404.1.3 光栅404.2 光栅外腔半导体激光器的机械结构40-414.3 外腔半导体激光器的驱动电路和温控电路41-424.3.1 外腔半导体激光器驱动电路414.3.2 外腔半导体激光器温控电路41-424.4 实验调节42-434.4.1 光路准直424.4.2 调节光栅及二次调节准直42-434.5 本章小结43-44第五章 光栅外腔半导体激光器的输出特性测量44-535.1 激光器输出特性测量系统44-455.1.1 测量系统的组成445.1.2 测量中所用到的仪器及精度44-455.2 外腔半导体激光器的功率特性455.2.1 外腔半导体激光器的阂值特性455.2.2 外腔半导体激光器的功率稳定性455.3 外腔半导体激光器的波长特性45-475.3.1 中