Method of Relativistic Spatiotemporal Optical Vortex Generation

Spatiotemporal optical vortex (STOV) with transverse orbital angular momentum (TOAM) can induce some novel properties in high energy density physics.However, the current STOV pulse energy is limited to the mJ level, which greatly hinders the development of the research field of relativistic laser-matter interaction.Combined with the large-scale grating pair in high-peak-power laser facility, the method for generating of STOV with ultra-high intensity up to 10 21 W/cm 2 is proposed.The numerical simulation proves that the wave packet with 60 fs duration and 83 J energy can be generated in the far field, maintaining an integral spatiotemporal vortex construction.Simultaneously, STOVs with 1.1 mJ single pulse energy were obtained in a proof-of-principle experiment, and characterized by a home-made measuring device.