3利用多光束干涉提高啁啾脉冲信噪比的扫描滤波方案.doc

分类号：U D C：D10621-(2013)0827-0 密 级：公 开编 号： 利用多光束干涉提高超短脉冲信噪比的研究 论文作者姓名： 吴 亮 申请学位专业： 电子科学与技术 申请学位类别： 工学学士 指导教师姓名(职称)： 黄春玲(讲师) 论文提交日期： 2013年06月06日 利用多光束干涉提高超短脉冲信噪比的研究 摘 要 自激光诞生以来，在众多领域取得了重大突破，为人类探索未知世界提供了强有力的手段。在其实际应用中，如何提高啁啾脉冲信噪比一直是超短脉冲系统研究的重点工作。本文分析比较了超短脉冲信噪比提升技术现状，在此基础上，提出了一种利用多光束干涉扫描滤波法提高超短脉冲信噪比的方案，并对方案进行了数值模拟。论文的主要内容为(1) 介绍了飞秒激光的发展背景，啁啾脉冲放大技术和超短脉冲信噪比的基本理论；(2) 建立了信号模型和噪声模型，详细阐述了扫描滤波法提高啁啾脉冲信噪比的原理；(3) 提出了一种基于内置电光晶体F-P标准具的扫描滤波方案并给出了方案实例。该方案利用F-P多光束干涉原理和晶体的线性电光效应，通过调制电光晶体两端的电压，使电光晶体输出的透过光谱滤波函数与啁啾脉冲信号光的啁啾率一致，从而使啁啾信号脉冲高效率的通过，而噪声的透过率很小，以达到提高啁啾脉冲信噪比的目的。并推导出了电光晶体加载电压的时变函数表达式，分析了影响信噪比提升效果的主要因素，并重点讨论了电光晶体的电压控制参数对信噪比提升效果和滤波器透过率的影响。结果表明，该方案提高啁啾脉冲信噪比可达两个数量级。 关键词：F-P标准具；啁啾脉冲；电光效应 The Investigation of the Customer Satisfaction for the Construction of Electronic Resources of the University Library Abstract Since the laser its born, it has achieved a major breakthrough in many areas, provides a powerful means for the human exploration of the unknown world. In its actual application, how to improve the chirped pulse signal-to-noise ratio has been the focus of research of the ultrashort pulse. This paper analyzes and compares the ultrashort pulse SNR improvement situation, on this basis, put forward a kind of interference scanning filtering method to improve the signal-to-noise ratio of the ultrashort pulse scheme using multiple beam, and has carried on the numerical simulation. The main content of this thesis is: (1) introduced the development background of femtosecond laser, chirped pulse amplification technology and basic theory of ultrashort pulse signal-to-noise ratio. (2) to establish the signal model and noise model, describes in detail the scanning filtering principle of improving SNR of chirped pulse. (3) A Fabery-Perrot scanning spectral filter program for improving the SNR of chirp pulse has been designed,and it gives the project example. using the principle of multiple beam interference of the F-P etalon and the linear electro-optic effect of the crystal, the o