High-Channel Spectral-Temporal Active Recording (H-STAR) for Femtosecond Scenes Observation in a Single-Shot

Ultrafast compressed imaging is promising for capturing a large number of frames and providing single-shot observations of various unknown and important transient scenes. However, this technique often compromises spatial resolution in order to capture ultrafast phenomena with larger frame numbers. In this paper, a high-channel spectral-temporal active recording (H-STAR) is proposed, which achieves both femtosecond-level ultrafast imaging speed and high spatial resolution by substantially increasing the number of imaging channels. H-STAR can realize the highest spatial resolution of 101.6 lp/mm, the highest frame rate of 5.52 trillion frames per second, and the highest frame number of 120. The advantages of H-STAR, including its compact optical structure, high frame rate, large number of frames, and high imaging quality, are demonstrated through the capture of laser-induced plasma dynamics and the twice-reflection of the light spot. H-STAR enables single-shot and precise recording of ultrafast processes with both spatial and temporal complexity.