Spin constrained orbital angular momentum control in high-harmonic generation

TL;DR

This paper demonstrates how spin and orbital angular momentum interplay can be used to control the wavefront and angular momentum of high harmonics in both solid and gas phases, extending to extreme-ultraviolet wavelengths.

Contribution

It introduces a method to manipulate high harmonic angular momentum using spin-orbital interactions and proposes a bi-color scheme for spectral separation of EUV radiation.

Findings

Controlled orbital angular momentum in high harmonics from solids and gases.

Extended angular momentum control to extreme-ultraviolet wavelengths.

Proposed bi-color scheme for EUV radiation with orbital angular momentum.

Abstract

The interplay between spin and orbital angular momentum in the up-conversion process allows us to control the macroscopic wave front of high harmonics by manipulating the microscopic polarizations of the driving field. We demonstrate control of orbital angular momentum in high harmonic generation from both solid and gas phase targets using the selection rules of spin angular momentum. The gas phase harmonics extend the control of angular momentum to extreme-ultraviolet wavelength. We also propose a bi-color scheme to produce spectrally separated extreme-ultraviolet radiation carrying orbital angular momentum.