用于少周期脉冲快速时空表征的单次扫描双功能干涉仪
Single-scan, dual-functional interferometer for fast spatiotemporal characterization of few-cycle pulses
AI总结：
针对传统超短脉冲时空表征需额外测量、系统复杂的问题，提出集成干涉式FROG与径向剪切迈克尔逊干涉仪的双功能装置，单次扫描即可同时获取两类数据，实现少周期脉冲快速三维重建。
摘要：
在强场激光科学与技术领域，对高强度超短脉冲的时空信息进行准确、快速的表征至关重要。传统自参考干涉仪虽被广泛用于提取脉冲相对光谱相位的空间分布，但为消除不确定性，还需额外测量激光束特定位置的时间和光谱信息，这增加了系统复杂度。本文报道了一种先进的双功能干涉仪，仅需对干涉仪臂进行单次扫描即可重建超短脉冲的完整时空信息。该装置将干涉式频率分辨光学门（FROG，frequency-resolved optical gating）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，可同时获得激光束中心部分的互相关FROG迹线，以及整个激光分布的依赖于延迟的干涉图，从而实现少周期激光脉冲的快速三维重建。
英文摘要：
Accurate and fast characterization of spatiotemporal 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 were, however, 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 spatiotemporal information of ultrashort pulses with a single scan of the interferometer arm. The set-up integrates an interferometric frequency-resolved optical gating (FROG) with a radial shearing Michelson interferometer. Trough scanning one arm of the interferometer, both cross-correlated FROG trace at the central part of the laser beam and delay-dependent interferograms of the entire laser profile are simultaneously obtained, allowing a fast 3-dimensional reconstruction of few-cycle laser pulses.
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