微型脉冲全光纤激光器研究
文献类型：学位论文
| 作者 | 刘源 |
| 学位类别 | 博士 |
| 答辩日期 | 2010 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 陈卫标 |
| 关键词 | 微型全光纤化脉冲光纤器 种子源放大 大模场面积双包层光纤 人眼安全单频全光纤激光器 高重频窄脉宽全光纤激光器 |
| 其他题名 | Study on compact all-fiber pulsed fiber laser |
| 中文摘要 | 微型脉冲全光纤激光器由于其在体积、重量、散热性能、功耗、稳定性、光束质量、转换效率等方面的优点，在激光加工、医疗、激光雷达、激光测距等领域具有广泛的应用。本论文主要针对相干测风激光雷达和空间三维扫描激光雷达所需要的光源，对微型脉冲全光纤激光器进行理论和实验上的研究。 第一章回顾了相干测风激光雷达和空间三维扫描激光雷达以及发射光源的发展现状和趋势，比较了几种脉冲光纤激光器技术路线，分析微型脉冲全光纤激光器的关键元器件和材料，主要是光纤光栅、高掺杂的磷酸盐光纤、尾纤耦合的大功率半导体激光器、包层泵浦技术、大模场双包层光纤及其熔接技术，以及泵浦耦合器、模场适配器等。 第二章从传输方程出发，对掺铒光纤放大器的小信号放大特性进行了计算模拟，研究了掺铒光纤放大器的特性，分析了脉冲放大器过程中的放大的自发辐射（Amplified Spontaneous Emission, ASE）和受激布里渊散射（stimulated Brillouin scattering, SBS）效应及其抑制方法。 第三章针对基于人眼安全的全光纤相干多普勒测风系统的需求，开展窄线宽、掺铒脉冲光纤激光器的设计、器件研制和实验研究。采用种子源放大技术方案，分别采用两种单频种子源：光纤耦合的DFB半导体激光器和短腔式磷酸盐光纤激光器，利用铒镱共掺的大模场光纤构建了一个级联式放大系统。该系统在抽运功率8.2W时获得波长1.5m、线宽1.1MHz、脉冲能量101J的输出，基本能满足探测距离1km左右的相干测风雷达对光源的要求。同时研究了不同种子源下，级联式放大过程中的功率、脉冲和线宽的变化情况，观察并消除ASE和SBS等效应的影响。 针对小型化扫描型激光雷达的需求，开展高重复频率、短脉冲微型光纤激光器的设计、研制和实验研究。同样采用种子源放大技术方案，采用国产大模场面积双包层光纤，以直接电调制的半导体激光器模块为种子源，研制出1064nm、重频50KHz、脉宽11ns、峰值功率8200W的全光纤化高重频脉冲光纤激光器。基于该激光器，从信号光的功率、重复频率、光谱、泵浦方式、主放光纤的选择和优化对放大激光性能的影响等几个角度研究微型脉冲全光纤激光器。 |
| 英文摘要 | Compact all-fiber pulsed fiber laser is one of the research foucses because of its small volume, light weight, high efficiency, as well as compact architecture. It has shown extremely attractive prospect for its application in industry, medical technology, scientific research, military science and other fields. All-fiber lasers and amplifiers are recognized as the best way to be practical and industrialized, and they are the only technical programs that are commercial and industrial at present. In the thesis, theoretical and experimental study on all-fiber pulsed fiber laser for ladar transmmiter is presented. In the first chapter, development of the coherent Doppler wing lidar and spaceborne 3D laser lidar are reviewed. To meet the requirements of the transmitter for these two applications, research on compact all-fiber pulsed fiber laser are carried on. The latest three progresses and development trends of high power pulsed fiber laser adopting master-oscillator power amplifier, Q-switched and mode-locked techniques are compared, and the key technology of compact pulsed all-fiber pulsed laser such as fiber grating, high-doped phosphate fiber, high-power fiber-coupled diode laser, cladding pump technology, large mode area double-clad fiber as well as its splicing, combiner, mode filed adaptor and so on are analyzed. In the second chapter, the amplification characteristics are analyzed by transmission equations and the physical model of Er-doped fiber amplifier. The characteristics and structural design of erbium-doped fiber amplifier are studied, furthermore, Amplified Spontaneous Emission (ASE), stimulated Brillouin scattering (SBS) of the pulsed amplifier and the suppression technical are analyzed. In the third chapter, to meet the requirement of eye-safe all-fiber coherent Doppler wind lidar transmmiter, many aspects of the narrow-linewidth erbium-doped pulsed fiber laser are studied, such as the design of the structural, the manufacture of the components and the experimental study. A single frequency pulsed all-fiber master-oscillator power-amplifier laser system was developed by a three-stage amplifier system. Two single-frequency seed source are used such as DFB semiconductor lasers of fiber coupled and short- cavity phosphate fiber lasers were used. With a maximum input pump power of 8.4W, an average output power of 1.01 W and the maximum pulse energy of 101μJ were obtained based on the short- cavity phosphate fiber laser seeder, while the output laser linewidth of the system was kept less than 1.1MHz. This laser was suitable for the laser transmitter of a coherent Doppler lidar to measure wind speed in lower atmosphere layer around 1km. Some characteristics of amplifier such as power, spectrum, linewidth and so on are compared when use different seed sources, and experiments to suppress the effect of ASE and SBS are carried out. High repetition rate and narrow pulse width are the main characteristics of next generation space-based Lidar transmmiter. To meet the requirement, an all-fiber pulsed fiber laser was generated by master-oscillator power amplifier architecture with a modulated laser diode seeder. At the pulse repetition rate of 50 kHz, pesk power of 8200 W, and pulse width of 11ns are achieved. Based on this laser, many aspects that affect the characteristic of the amplifier are studied, such as the power and spectrum properties of the signal, the pump arcirecture, repetition rate of the seed, and selection and optimization of the power-amplifier fiber. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15658]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 刘源. 微型脉冲全光纤激光器研究[D]. 中国科学院上海光学精密机械研究所. 2010. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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