Single-shot ultrafast imaging based on round-view projection (RVP)

Current ultrafast imaging techniques necessitate single-shot continuous recording capabilities to capture non-repetitive ultrafast phenomena. Among various methods, projection-based ultrafast imaging methods have garnered significant attention due to their ability to acquire multiple frames in a single exposure. However, the reconstruction accuracy of these methods is fundamentally constrained by the limited number of projection directions and partial angular coverage. In this study, we introduce a spectral-temporal ultrafast imaging system based on the round-view projection (RVP), which enables comprehensive data acquisition through multiple quasi-omnidirectional projections, facilitating effective compression and reconstruction of spatiotemporal data cubes. Numerical simulations demonstrate that the RVP achieves superior reconstruction fidelity by capturing quasi-omnidirectional characteristic information. In the experimental works, we captured the dynamics of laser-induced air plasma, such as shockwave propagations and plasma expansion, with 22 frames in a single shot. This work not only presents a robust ultrafast imaging methodology but also provides valuable insight for advancing related ultrafast imaging research.