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题名	光纤激光自相位调制效应研究
作者	白洋
文献子类	硕士
导师	何兵
关键词	激光器 lasers 激光光学 laser optics 光纤激光器 fiber laser 自相位调制 self-phase modulation 光子晶体光纤 photonic crystal fiber
其他题名	Study on Self-phase Modulation in Fiber Laser
英文摘要	光纤激光自相位调制效应是光场在光纤介质中传输时光场本身感应的相移，脉冲不同部位对应不同的相移，相移大小的不一致产生新的光谱频率成分，在感应光谱展宽形式上往往表现为波浪式多峰振荡结构。 高峰值功率皮秒脉冲激光器在非线性波长转换、微结构加工等领域有着很大的应用价值。锁模技术可以产生较低功率的皮秒激光脉冲，实现高功率脉冲激光一般采用主振荡功率放大（MOPA，Main Oscillation Power Amplification）结构，通过将皮秒种子多级放大，实现高能量输出。在皮秒脉冲激光放大过程中，自相位调制（SPM, Self-phase Modulation）效应为非线性效应主要表现之一。在非线性波长变换等应用中，如倍频，相位匹配要求基频光光谱宽度较窄，需要研究与抑制高峰值功率下自相位调制效应（SPM）引起的光谱展宽。光子晶体基于其高纤芯包层比，相比于传统的双包层光纤更有利于抑制自相位调制效应带来的光谱展宽等非线性现象。 本论文围绕光纤激光传输、放大过程中的自相位调制效应，简明扼要的介绍该领域的基本研究模型和研究进展，建立实验系统与仿真框架模型，主要针对高峰值功率皮秒激光放大系统中的SPM现象，进行不同峰值放大功率下的光谱特性研究，这主要是为了弄清楚输出光谱展宽影响机制，并对光谱展宽量与激光输出峰值功率关系的验证，为高峰值功率皮秒激光放大中自相位调制效应引起的光谱展宽现象提供一些科学参考意义。 第一章介绍了光纤激光自相位调制效应，重点涉及自相位调制效应的技术与现象，并在此基础上总结了光纤激光自相位调制效应引起光谱展宽带来的发展瓶颈。 第二章介绍了自相位调制效应的产生机理与影响因素。探讨分析光纤激光传输及放大过程的两个基础数学模型，即描述光场传输的非线性薛定谔方程模型与描述光场放大过程的金兹堡-朗道方程模型。在此基础上，介绍分析了光纤激光传输过程中光纤自相位调制效应基础数学模型。接着从数值上模拟了自相位调制效应与一些影响因子，如入射光场的脉冲形状、入射脉冲初始啁啾因子，之间的关系，并进行分析。最后结合实际应用过程中的影响因子建立光纤激光自相位调制效应的理论仿真框架。为下一步研究激光在光纤传输放大过程中引起的光谱展宽及对实际系统的模拟仿真提供架构。 第三章设计搭建皮秒激光传输测试系统，并对系统进行测试。通过皮秒激光传输数学仿真模型对测试系统进行仿真模拟。通过实验与理论的比对，研究了皮秒激光自相位调制效应测试系统的光谱特性。 第四章介绍光纤自相位调制引起光谱展宽的抑制方法。搭建高峰值功率皮秒光纤放大系统。对光纤激光放大系统进行测试。从实验和理论上共同对高峰值功率皮秒光纤放大系统光谱特性进行研究。建立非线性仿真抑制模型，并分析了抑制光纤激光自相位调制效应的一些因子。为研究自相位调制引起的光谱展宽现象提供理论支持。; The self-phase modulation effect of fiber laser is the phase shift of the light field itself when the optical field is transmitted in the optical fiber medium.Different parts of the pulse correspond to different phase shifts. Different phase shifts produce new spectral frequency components.The form of the induced spectral broadening is often expressed as wave multimodal oscillation structure. High peak power picosecond pulsed lasers have great application value in nonlinear wavelength conversion, microstructure processing and other fields.The mode-locking technique can produce lower power picosecond laser pulses,and the high power pulsed laser is generally used in the main oscillation power amplification (MOPA) structure, through the picosecond seed multi-level amplification to achieve high energy output. In the picosecond pulse laser amplification process, the nonlinear effect is mainly manifested as self-phase modulation (SPM). In applications such as nonlinear wavelength conversion, such as frequency doubling and phase matching require that the fundamental spectral spectral width is narrow, it is necessary to study and suppress the spectral broadening caused by self-phase modulation(SPM) at high peak power.Photonic crystals based on their high core cladding ratio, compared to the traditional double-clad fiber is more conducive to suppress the self-phase modulation of spectral broadening and other non-linear phenomenon. In this paper, the basic research model and research progress in the field of optical fiber laser transmission and amplification are introduced. The experimental system and the simulation frame model are established, which mainly focuses on the SPM phenomenon of the high peak power picosecond laser amplification system.The spectral characteristics of different peak amplifying power are studied. This is mainly to clarify the influence mechanism of output spectrum broadening and to verify the relationship between spectral broadening and laser output peak power.Which provides some scientific reference for the phenomenon of spectral broadening caused by self-phase modulation in high peak power picosecond laser amplification. In Chapter I, the self - phase modulation of fiber laser is introduced, and the technology and phenomenon of self - phase modulation effect are introduced. Based on this, the development bottleneck caused by the self - phase modulation effect of fiber laser is summarized. In Chapter Ⅱ, The generation mechanism and influencing factors of self - phase modulation are introduce. Two basic mathematical models for analyzing the laser transmission and amplification process are discussed. A Nonlinear Schr (o) dinger Equation Model for Light Field Transmission and a Ginzburg-Landau Equation Model for Describing the Magnification of Light Field. On this basis, the paper introduces the mathematical model of optical fiber self-phase modulation during fiber laser transmission. Then the relationship between the self - phase modulation effect and some influencing factors is simulated numerically.Such as the pulse shape of the incident light field, the initial chirp of the incident pulse. Finally, the theoretical simulation framework of fiber laser self-phase modulation effect is established by combining the influence factors in the practical application process. For further study of the laser in the optical fiber transmission amplification process caused by spectral broadening and simulation of the actual system simulation simulation to provide a simulation architecture. In Chapter Ⅲ, the picosecond laser transmission test system was designed. And the simulation system was simulated by picosecond laser transmission mathematical simulation model. The spectral characteristics of the picosecond laser self - phase modulation test system are studied by comparing the experimental and theoretical studies. In Chapter Ⅳ, the fiber laser amplification system was tested and a nonlinear simulation suppression model was established. And Introduce the structure of the high peak power picosecond optical fiber amplification system. The fiber laser amplification system is tested and a nonlinear simulation suppression framework model is established. Then, the spectral characteristics of high peak power picosecond optical fiber amplifying system were studied from experiment and theory. Some factors that suppress the self - phase modulation effect of fiber laser are analyzed. Which provides theoretical support for studying the phenomenon of spectral broadening caused by self-phase modulation.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/30955]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	白洋. 光纤激光自相位调制效应研究[D].

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