Open AccessGeneration of elliptically polarized soft x rays using high-order harmonic generation with orthogonal two-color laser fields
Author(s) -
D. B. Milošević,
W. Becker
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1508/1/012001
Subject(s) - elliptical polarization , high harmonic generation , physics , laser , harmonics , monochromatic color , harmonic , optics , field (mathematics) , photon , harmonic spectrum , wavelength , phase (matter) , linear polarization , quantum mechanics , mathematics , voltage , pure mathematics
High-order harmonic generation by orthogonally polarized two-color (OTC) laser fields is analysed using strong-field approximation and quantum-orbit theory. Results for the field components frequency ratio of 2:1 and 3:1 are presented and compared. We have shown that, depending on the relative phase between the field components, the shape of the high-harmonic spectrum can be very different from that obtained by a monochromatic linearly polarized laser field. It is also shown that it is possible to generate elliptically polarized high-order harmonics with very high photon energies using OTC laser field with the frequency ratio of 3:1 and a long fundamental wavelength. An effective relative phase control of the harmonic emission is demonstrated. The obtained results are explained using the quantum-orbit theory.