【作者】 何铁英；

【导师】 柴路； 张志刚；

【作者基本信息】 天津大学 ， 光学， 2004， 硕士

【摘要】 本文对光谱位相相干直接电场重建法（Spectral Phase Interferometry for DirectElectrical-Field Reconstruction，简称 SPIDER）进行了理论和实验研究，论文工作的主要内容包括以下几个方面： ? ? 　 概括了近年来超短激光脉冲评价技术的发展情况，介绍了光谱位相 相干直接电场重建法（SPIDER）产生的背景，分析了 SPIDER 装 置测量超短激光脉冲的原理，深入剖析了 SPIDER 脉冲位相还原算 法的流程。　 ? ? 　 基于 SPIDER还原飞秒脉冲电场的基本理论，通过进行数值模拟， 重点研究了τ，　φ& ，Ω 三个参数之间的关系，以及它们对测量误差 & 的影响。特别是确定出对于不同宽度脉冲的最佳τ的选取范围，以 及展宽器色散φ& 对 SPIDER 测量范围的限制。 & ? ? 　 分析了 SPIDER 光谱位相干涉仪中非线性晶体 BBO 位相匹配类型 的选取原则，建立了基于 SPIDER 测量的 BBO 晶体光谱滤波器的 公式模型，计算了不同参数 BBO 晶体的和频效率带宽，对于不同 宽度的待测脉冲，确定了 BBO 光谱滤波器的厚度范围。 ? ? 　 建立了适用于测量较窄飞秒脉冲位相的 SPIDER 实验装置，其中， 基于美国 NI 公司的 LABVIEW 图形编程开发环境，成功地开发出 人机对话型接口软件，使SPIDER装置的操作更加实时化和可视化。 应用该装置对一台掺钛蓝宝石飞秒激光器输出脉冲的光谱位相进 行了实际测量和诊断，得到比较满意的结果。更多还原

【Abstract】 In this thesis, theoretical and experimental studies on Spectral PhaseInteferometry for Direct Electric-Field Reconstruction (SPIDER) were presented. Themain contents are as follows: 1. The development and application of femtosecond pulses characterizations were introduced. The background of the SPIDER technique was described and the theory of phase retrieving was demonstrated. 2. The correlations among three important parameters in SPIDER, the time delay τbetween the test pulse replicas, the frequency shear Ω and the second-order dispersion φ& determined from a stretcher, are investigated. The results show & that there are different optimum time delayτfor different test pulse with a fixed φ& . The measurement maybe fail if the frequency shear Ω that is direct & proportion to the time delayτbecomes too large to meet the condition of the sum-frequency. Therefore, for the different widths of pulses, the magnitude of φ& should be properly adjusted for selecting the optimumτ. & 3. The model of spectral filter of the nonlinear crystal in a SPIDER apparatus was constructed. The relationship between the bandwidth of the conversion efficiency of BBO crystal and the crystal thickness was calculated. The choice range of the BBO thickness adapting to the different widths of pulses was discussed. 4. The SPIDER apparatus was set up and the complete retrieval algorithm of SPIDER was performed with a LABVIEW code of NI. The experimental results for characterizing femtosecond pulses from a Ti:sapphire oscillator with this SPIDER apparatus were demonstrated. At last the realization of real-time SPIDER including optical parts and the LABVIEW program was completed.更多还原