Chen Y F, Huang Z Y, Wang D, Zhao Y, Fu J H, Pang M, Leng Y X, Xu Z Z
Opt Lett. 2020 Sep 15;45(18):5081-5084. doi: 10.1364/OL.403575.
Accurate and fast characterization of spatio-temporal information of high-intensity, ultrashort pulses is crucial in the field of strong-field laser science and technology. While conventional self-referenced interferometers were widely used to retrieve the spatial profile of the relative spectral phase of pulses, additional measurements of temporal and spectral information at a particular position of the laser beam, however, were necessary to remove the indeterminacy, which increases the system complexity. Here we report an advanced, dual-functional interferometer that is able to reconstruct the complete spatio-temporal information of ultrashort pulses with a single scan of the interferometer arm. The setup integrates an interferometric frequency-resolved optical gating (FROG) with a radial shearing Michelson interferometer. Through scanning one arm of the interferometer, both the cross-correlated FROG trace at the central part of the laser beam and the delay-dependent interferograms of the entire laser profile are simultaneously obtained, allowing a fast three-dimensional reconstruction of few-cycle laser pulses.
在强场激光科学与技术领域，准确快速地表征高强度超短脉冲的时空信息至关重要。虽然传统的自参考干涉仪被广泛用于获取脉冲相对光谱相位的空间分布，但为了消除不确定性，还需要在激光束的特定位置额外测量时间和光谱信息，这增加了系统的复杂性。在此，我们报道了一种先进的双功能干涉仪，它能够通过单次扫描干涉仪臂来重建超短脉冲的完整时空信息。该装置将干涉频率分辨光学门控（FROG）与径向剪切迈克尔逊干涉仪集成在一起。通过扫描干涉仪的一个臂，同时获得激光束中心部分的互相关FROG迹线和整个激光轮廓的延迟相关干涉图，从而能够对少周期激光脉冲进行快速三维重建。
