The spatial, temporal, and spectral information in optical imaging play a crucial role in exploring the unknown world and unencrypting natural mysteries. However, the existing optical imaging techniques can only acquire the spatiotemporal or spatiospectral information of the object with the single-shot method. In this talk, I’d like to introduce a hyperspectrally compressed ultrafast photography (HCUP) that can simultaneously record the spatial, temporal, and spectral information of the object. In our HCUP, the dynamical spatial resolution is 1.26 lp/mm in the horizontal direction and 1.41 lp/mm in the vertical direction, the temporal frame interval is 2 ps, and the spectral frame interval is 1.72 nm. Based on our HCUP, we realized the spatiotemporal-spatiospectral four-dimensional optical imaging of the chirped picosecond laser pulse and the photoluminescence dynamics. It can be expected that HCUP is flexible to couple to a variety of imaging modalities, including microscopes and telescopes, which enable recording the object at the spatial scales from cellular organelles to galaxies. Considering the powerful function of HCUP in optical imaging, it will open a new route in related application areas.
Compressed ultrafast photography (CUP) is a burgeoning single-shot computational imaging technique that provides an imaging speed as high as 10 trillion frames per second and a sequence depth of up to a few hundred frames. This technique synergizes compressed sensing and the streak camera technique to capture nonrepeatable ultrafast transient events with a single shot. With recent unprecedented technical developments and extensions of this methodology, it has been widely used in ultrafast optical imaging and metrology, ultrafast electron diffraction and microscopy, and information security protection. We review the basic principles of CUP, its recent advances in data acquisition and image reconstruction, its fusions with other modalities, and its unique applications in multiple research fields.