Ultrafast multitarget control of tightly focused light fields

https://phys.org/news/2022-04-ultrafast-multitarget-tightly-focused-fields

"ultrafast modulation of multi-target focal fields based on the facile combination of the time-dependent vectorial diffraction theory with the fast Fourier transform... tightly focusing radially polarized femtosecond pulse vortex laser beams in a single objective lens geometry... ultrafast temporal degree of freedom within a configurable temporal duration (~400 fs)... bright-dark alternation, periodic rotation, and longitudinal/transverse polarization conversion"