Fig. 1. The intensity and phase distributions of the incident spatiotemporal wavepacket

Fig. 2. Schematic diagram of the tight focusing of STOV

Fig. 3. Intensity and phase distributions of tightly focused wavepackets with pure transverse OAM and pure longitudinal OAM

Fig. 4. The intensity and phase distributions of the tightly focused spatiotemporal wavepacket with both transverse and longitudinal OAM

Fig. 5. Phase singularity track of tightly focused spatiotemporal wavepacket

Fig. 6. The phase distributions of tightly focused wavepacket in the x-y planes at different positions along the t-axis

Fig. 7. The OAM value of different slices of the tightly focused spatiotemporal wavepacket

Fig. 8. The relationship between the OAM of the focused wavepacket and longitudinal OAM topological charge of the incident wavepacket