Polarization control of attosecond pulses using bi-chromatic elliptically polarized laser

Abstract

We study the higher-harmonic generation (HHG) using elliptically polarized two-color driving fields. The HHG via bi-chromatic counter-rotating laser fields is a promising source of circularly polarized ultrashort XUV radiation at the attosecond time scale. The ellipticity or the polarization of the attosecond pulses can be tweaked by modifying the emitted harmonics' ellipticity, which can be controlled by varying the driver fields. We propose a simple setup to control the polarization of the driving fields, which eventually changes the ellipticity of the attosecond pulses. A well-defined scaling law for the ellipticity of the attosecond pulse as a function of the rotation angle of the quarter-wave plate is also deduced by solving the time-dependent Schrodinger equation (TDSE) in two dimensions. The scaling law can further be explored to obtain the attosecond pulses of the desired degree of polarization, ranging from linear to elliptical to circular polarization.

7 pages, 6 figures

References in corpus (4)

• Attosecond-resolved photoionization of chiral molecules
• Spin conservation in high-order-harmonic generation using bicircular fields
• Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators
• Time-resolved high harmonic spectroscopy of dynamical symmetry breaking in bi-circular laser fields

Cited by in corpus (3)

• Generation of Circularly-Polarised High-Harmonics with Identical Helicity in Two-Dimensional Materials
• High-order harmonic generation by sub-cycle laser pulses and associated scaling laws
• Bi-chromatic driver enabled control of high harmonic generation in atomic targets