Open AccessShortcut to study angular momentum transfer of harmonic generation in intense laser fields
Author(s) -
Yingtong Su,
K. Fang,
Jingtao Zhnag
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.430041
Subject(s) - physics , angular momentum , high harmonic generation , harmonics , optics , bessel function , laser , scattering , quantum electrodynamics , computational physics , quantum mechanics , voltage
High-order harmonics generated from atoms driven by counter-rotating two-color circularly (CRTC) polarized laser fields are studied in the frame of a quantum-field scattering theory. We use a pair of generalized phased Bessel (GPB) functions to describe the harmonic generation amplitude. The use of GPB functions allows us to define the phase of a harmonic channel accurately, by which we obtain the spin angular momentum conservation relation in a straightforward way. The known selection rule of harmonic order in the CRTC field is obtained concisely. Main features of the harmonic spectra are recovered. Our treatment provides a shortcut to study the angular momentum transfer in intense laser fields.