无干涉条纹的光谱位相相干直接电场重构法

提出一种新的诊断飞秒脉冲振幅与位相的高精度测量方法.该方法发展了传统的SPIDER方法，保留了原方法对脉冲信息可以实时、有效和全面地测取的优点，并能克服其不能测量脉宽较大或位相信息复杂的脉冲的缺点.在新方法中和频后的脉冲对没有相对延时，形成无干涉条纹的剪切干涉图.在调节一个小量延时于某些特定值，可去掉剪切干涉图的歧义性.给出数值模拟结果，证明此方法无需经过傅里叶变换滤波，可直接由干涉图唯一地提取出脉冲的振幅与位相信息. 关键词： 光谱位相相干直接电场重构法 飞秒脉冲测量 超快信息光学

Fringe-free spectral phase interferometry for direct electric-field reconstruction

A novel spectral phase interferometry reconstruction for ultrashort optical pulse measurement with high accuracy is presented to overcome the shortcomes of conventional SPIDER. The measured pulse and its two chirped and delayed replicas are mixed synchronously to generate a fringe-free interference pattern. By introducing a suitable small delay into the interference pattern the spectral phase of the measured pulse is retrieved directly and uniquely without using Fourier transformation. This technique is capable of characterizing pulses with long duration or/and complex phase structure.