Characterizing Light Vortex in Spacetime: Characterizing Designer Beams in Spacetime. Artistic rendering of an ultrafast vortex pulse carrying spatiotemporal orbital angular momentum is measured to reveal its pulse dispersion, beam divergence, and topological charges in space-time. Publication: G. Gui, N. Brooks, B. Wang, H. Kapteyn, M. Murnane, and C.-T. Liao. “Real-time single-frame characterization of ultrafast pulses with spatiotemporal orbital angular momentum,” ACS Photonics 9, 8, 2802 (2022) [ACS Editors’ Choice®] [Featured on the ACS Photonics cover] / This work is supported by an AFOSR MURI grant (FA9550-16-1-0121) - Harnessing Strong-Field Mid-Infrared (IR) Lasers: Designer Beams of Relativistic Particles and THz- to-X-ray Light. Contributors: Chen-Ting Liao, Steven Burrows (art illustration), the Murnane and Kapteyn groups