We propose a simple single-shot spatiotemporal measurement technique called coherent modulation imaging for the spatio-spectrum (CMISS), which reconstructs the full three-dimensional high-resolution characteristics of ultrashort pulses based on frequency-space division and coherent modulation imaging. We demonstrated it experimentally by measuring the spatiotemporal amplitude and phase of a single pulse with a spatial resolution of 44 µm and a phase accuracy of 0.04 rad. CMISS has good potential for high-power ultrashort-pulse laser facilities and can measure even spatiotemporally complicated pulses with important applications.

In strong-field physics experiments with ultra-intense lasers, single-shot crosscorrelator (SSCC) is essential for fast optimization of the pulse contrast and meaningful comparison with theory for each pulse shot. To simultaneously characterize an ultrashort pulse and its long pedestal, the SSCC device must have both a high resolution and large temporal window. However, the resolution and window in all kinds of single-shot measurement contradict each other in principle. Here we propose and demonstrate a novel SSCC device with two separate measurement channels: channel one for the large-window pedestal measurement has a moderate resolution but a large window, while channel two for the ultrashort pulse measurement has a small window but a high resolution; this allows the accurate characterization of the pulse contrast in single-shot. A two-channel SSCC device with a 200-fs resolution and 114-ps window has been developed and tested for its application in ultra-intense lasers at 800 nm.

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