高功率二极管横向泵浦铯蒸气激光MOPA系统的动力学模型
发布时间：2018-09-03 10:47
【摘要】：高功率二极管泵浦的碱金属蒸气激光器DPALs (Diode Pumped Alkali Vapor Lasers)是近几年来人们所广泛关注的新型激光器件。DPALs将固体激光器和气体激光器的优点融入一体,在得到高效、高功率的近红外激光输出方面有着较为突出的优势。同时DPALs具有量子效率高,光束质量好,和线宽窄(可达MHz)等优点,可以广泛的应用到军事领域、定向能力传输、以及激光加工领域。最近几年,各国科学家对DPALs进行了相关研究并得到了较大进展。目前,较多的研究在于对泵浦源和抽运方式的改进,通过调节缓冲气体压强比以及提高谐振腔和泵浦光之间的模式匹配系数,来获得高效、高功率的激光输出。然而,关于横向泵浦模型下的碱金属蒸气激光MOPA系统的动力学机制和相关实验方面的文献较少,因此,深入研究该类激光MOPA系统的激光放大动力学过程和输出特性具有重要意义。本文首先对二极管泵浦碱金属蒸气激光的发展背景及研究进展做了介绍。分别从纵向和横向两个方面阐释了DPALs的工作原理、相关技术路线、不同抽运方式下的动力学模型、实验设计以及DPALs的特点和应用。在此基础上考虑了饱和放大效应,综合分析了激光的放大机制和动力学过程,重新定义了种子光和泵浦光之间的模式匹配系数,分别建立起二极管横向单侧和双侧泵浦的高功率碱金属蒸气激光MOPA (Maser Oscillator and Power Amplifier)系统的动力学模型。模拟计算了系统中泵浦光功率、谐振腔长度、介质池内温度等对激光输出特性的影响。同时模拟了泵浦光功率在蒸气池中的分布,通过模拟最终得出泵浦光的强度在泵浦方向上呈现出非线性吸收的结果。通过计算得到了一组优化参数,对该类激光MOPA系统的优化设计提供了一定的参考。
[Abstract]:High power diode pumped alkali metal vapor laser (DPALs (Diode Pumped Alkali Vapor Lasers) is a new type of laser device. DPALs integrate the advantages of solid state laser and gas laser. High power near-infrared laser output has more outstanding advantages. At the same time, DPALs has the advantages of high quantum efficiency, good beam quality and narrow line width (up to MHz). It can be widely used in military field, directional capability transmission, and laser processing. In recent years, scientists from all over the world have made great progress in the research of DPALs. At present, much research is done on the improvement of pump source and pump mode. By adjusting the pressure ratio of buffer gas and increasing the mode matching coefficient between resonator and pump light, the high efficiency and high power laser output can be obtained. However, there are few literatures on the kinetic mechanism and related experiments of alkali metal vapor laser MOPA system under transversely pumped model. It is of great significance to study the laser amplification dynamics and output characteristics of this kind of laser MOPA system. In this paper, the development background and research progress of diode pumped alkali metal vapor laser are introduced. The working principle of DPALs, related technical route, dynamics model under different pumping modes, experimental design, characteristics and application of DPALs are explained from longitudinal and horizontal aspects respectively. On this basis, the saturation amplification effect is considered, the amplification mechanism and dynamic process of the laser are comprehensively analyzed, and the mode matching coefficient between the seed light and the pump light is redefined. A dynamic model of a high power alkali metal vapor laser (MOPA (Maser Oscillator and Power Amplifier) system pumped by diodes on one side and two sides was established respectively. The effects of pump power, cavity length and temperature in the dielectric cell on the laser output characteristics are simulated and calculated. At the same time, the distribution of the pump power in the vapor pool is simulated, and the nonlinear absorption of the pump intensity in the pump direction is obtained through the simulation. A set of optimization parameters are obtained by calculation, which provides a certain reference for the optimization design of this kind of laser MOPA system.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
本文编号：2219761
[Abstract]:High power diode pumped alkali metal vapor laser (DPALs (Diode Pumped Alkali Vapor Lasers) is a new type of laser device. DPALs integrate the advantages of solid state laser and gas laser. High power near-infrared laser output has more outstanding advantages. At the same time, DPALs has the advantages of high quantum efficiency, good beam quality and narrow line width (up to MHz). It can be widely used in military field, directional capability transmission, and laser processing. In recent years, scientists from all over the world have made great progress in the research of DPALs. At present, much research is done on the improvement of pump source and pump mode. By adjusting the pressure ratio of buffer gas and increasing the mode matching coefficient between resonator and pump light, the high efficiency and high power laser output can be obtained. However, there are few literatures on the kinetic mechanism and related experiments of alkali metal vapor laser MOPA system under transversely pumped model. It is of great significance to study the laser amplification dynamics and output characteristics of this kind of laser MOPA system. In this paper, the development background and research progress of diode pumped alkali metal vapor laser are introduced. The working principle of DPALs, related technical route, dynamics model under different pumping modes, experimental design, characteristics and application of DPALs are explained from longitudinal and horizontal aspects respectively. On this basis, the saturation amplification effect is considered, the amplification mechanism and dynamic process of the laser are comprehensively analyzed, and the mode matching coefficient between the seed light and the pump light is redefined. A dynamic model of a high power alkali metal vapor laser (MOPA (Maser Oscillator and Power Amplifier) system pumped by diodes on one side and two sides was established respectively. The effects of pump power, cavity length and temperature in the dielectric cell on the laser output characteristics are simulated and calculated. At the same time, the distribution of the pump power in the vapor pool is simulated, and the nonlinear absorption of the pump intensity in the pump direction is obtained through the simulation. A set of optimization parameters are obtained by calculation, which provides a certain reference for the optimization design of this kind of laser MOPA system.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
【参考文献】
相关硕士学位论文 前1条
1 陶天炯;激光稳频锁相研究[D];浙江大学;2010年
，本文编号：2219761
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