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题名	全光纤脉冲光纤激光器的设计与研究
作者	张寿棋
学位类别	硕士
答辩日期	2008
授予单位	中国科学院上海光学精密机械研究所
导师	楼祺洪
关键词	半导体激光器 温度控制 脉冲驱动电源 脉冲光纤放大器
其他题名	Design and research on all-fiber pulse fiber laser
中文摘要	脉冲光纤激光器以掺杂光纤为工作物质，以半导体激光器为泵浦源，在体积、能耗、光束质量等方面，同固体激光器相比，优势明显。基于种子光源主振荡放大(MOPA)方式的脉冲光纤激光器有利于获得脉冲能量高、平均输出功率大、光束质量好的激光光束，是一种比较理想的脉冲光纤激光实现方式，随着研制方案的进一步优化，有可能实现更大单脉冲能量和更高光束质量的脉冲激光输出。在这种技术方案中，性能参数合适的脉冲种子光源尤其重要。本文主要是研究和设计一种基于单模LD多级放大的全光纤脉冲光纤激光器，为实现脉冲双包层光纤激光器的国产化做好技术储备。 第一章综述了半导体激光器的发展及其应用，讨论了半导体激光器在温度方面的特性，并对半导体激光器驱动电源的设计要求和关键技术进行了分析。接着论述了脉冲光纤激光器的发展历史、发展趋势，介绍种子脉冲主振荡放大（MOPA）式的高平均功率光纤放大器。 第二章对自行研制的半导体激光器的温度控制系统进行了介绍。阐述了该系统的功能及实现原理，通过对部分硬件电路（温度采集电路，TEC驱动电路）和单片机的程序设计，采用PID温度控制算法，实现了温控精度<0.1℃（功率<1W）和<0.5℃(功率<30W)的半导体激光器温度控制系统。 第三章研制出了一种高重复频率、窄脉宽的半导体激光器脉冲驱动电源。基于功率场效应管的简化模型，推导出了功率场效应管的驱动特性。设计制作了多个参数连续可调的单模LD驱动脉冲电路。典型参数为脉宽20ns，重频50kHz，峰值电流30A。该电路同时具有脉冲峰值检测和自断电等保护功能，可有效保证LD的安全工作。 第四章对脉冲调制半导体激光器的多级光纤级联放大特性进行了研究，讨论了ASE和自激的抑制、光纤熔接、泵浦功率与光纤长度的优化等问题。建立了三级光纤级联放大系统，采用该系统，实现了对平均功率0.3mW脉冲种子光源的光纤放大，得到平均功率为2W、光束质量接近衍射极限的脉冲激光。
英文摘要	Compared with solid-state laser, Pulsed fiber laser which used fiber as its work material and LD as its pump source, has obvious advantages in volume, energy consumption, beam quality etc. The Pulsed fiber laser based on master oscillator fiber amplifier (MOFA) can get good beam quality, high power energy and average power, so it is an more ideal pulse output mode. With the further optimization of the scheme, it is possible to achieve greater single pulse energy and higher output beam quality. In this technology scheme, a pulse seed laser with suitable parameters is very important. In this thesis, we study and design an all-fiber pulse fiber laser based on multilevel fiber amplify using an electrically modulated single mode LD as seed laser diode to do some contribution to double-clad fiber pulsed laser technology and its domesticization. Chapter one first reviewed the development of semiconductor laser and its applications, discussed the temperature characteristics of semiconductor lasers, analyzed the design requirements and the key technologies of the drive of laser diode. Then reviewed the development history and development trend of pulse fiber lasers, and introduced master oscillator fiber amplifier (MOPA) fiber lasers and amplifiers. The second chapter presents a self-made laser diode temperature control system. First introduced the functions and principles of the system, analyzed the design of some hardware circuits (temperature acquisition circuit, TEC drive circuit); then introduced the program design, especially PID temperature control algorithms. Using this temperature control system for low-power (<1 W) laser diode, the stability is less than 0.1 degrees. In the third chapter the design of pulse semiconductor laser diode driver were introduced. First we deduced the drive characteristics of power FET from its simplified model. Then design a narrow pulse generator circuit and power FET drive circuit, the parameters of LD-driven pulse were 20 ns pulsewidth, 50KHZ frequency, 30A peak current and they were adjustable. At the same time introduced a self-designed protection circuit, using pulse peak detecting, self-power-off etc, effectively guarantee the security of LD. Experimental results show that the drive circuit works stably and is suitable for driving the LD. In the Chapter IV, the fiber amplify character of modulation semiconductor laser diode were studied. First discussed the key technologies: suppress of ASE、 self-excitation, fiber connect and weld, the best pump power and fiber length etc. In the Experiment, we use three stages to enlarge the 0.3mW pulse seed laser and get 2W average power of pulsed laser with good beam quality. the First and second stages use Ytterbium-doped single-mode fiber, 975 nm pump source, WDM coupled way to and the third stage used double-clad Yb-doped fiber, 915 nm and 975 nm pump sources. At last stage the output average power is 2W.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16541]
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	张寿棋. 全光纤脉冲光纤激光器的设计与研究[D]. 中国科学院上海光学精密机械研究所. 2008.

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