J. Wang,
M. Zepf,
Y. Leng,
R. Li,
and S. Rykovanov
Self-torqued harmonics and attosecond pulses driven by time-delayed relativistic vortex lasers
Phys. Rev. A, 106 :033515 (September 2022)
Self-torqued harmonics and attosecond pulses driven by time-delayed relativistic vortex lasers
Phys. Rev. A, 106 :033515 (September 2022)
Abstract:
Light carrying time-varying orbital angular momentum (OAM) is a recently discovered type of structured electromagnetic field compared with a typical vortex field whose OAM is static. Such so-called self-torqued light is employed for manipulating the fast magnetic, topological, and quantum excitations and increasing its intensity and having access to shorter pulse durations would be of great benefit. Here we theoretically and numerically demonstrate the generation of intense self-torqued harmonics and attosecond pulses in the relativistic regime, driven by two time-delayed relativistic vortex lasers with different OAMs l1 and l2. The OAM of the nth harmonic spans nl1 to nl2, and the OAM of the attosecond pulses changes from l1 to l2. Such intense self-torqued harmonics and attosecond pulses may offer alternative possibilities in ultrafast spectroscopy.