High-Harmonic Generation and Spin-Orbit Interaction of Light in a Relativistic Oscillating Window
Artikel i vetenskaplig tidskrift, 2021

When a high power laser beam irradiates a small aperture on a solid foil target, the strong laser field drives surface plasma oscillation at the periphery of this aperture, which acts as a "relativistic oscillating window."The diffracted light that travels though such an aperture contains high-harmonics of the fundamental laser frequency. When the driving laser beam is circularly polarized, the high-harmonic generation (HHG) process facilitates a conversion of the spin angular momentum of the fundamental light into the intrinsic orbital angular momentum of the harmonics. By means of theoretical modeling and fully 3D particle-in-cell simulations, it is shown the harmonic beams of order n are optical vortices with topological charge |l|=n-1, and a power-law spectrum In∝n-3.5 is produced for sufficiently intense laser beams, where In is the intensity of the nth harmonic. This work opens up a new realm of possibilities for producing intense extreme ultraviolet vortices, and diffraction-based HHG studies at relativistic intensities.


Longqing Yi

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 126 13 134801


Acceleratorfysik och instrumentering

Atom- och molekylfysik och optik





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