2015/04/30 by Lukas Medišauskas, Jack Wragg, Hugo van der Haart +1 · 1 citation
Physics and Astronomy · #physics.atom-ph
paper · pdf · doi:10.1103/physrevlett.115.153001
12 pages, 3 figures
arxiv created 2015/09/10 · arxiv updated 2015/10/28
Spectra of circularly polarized harmonics is calculated by numerically solving the Time-Dependent Schrödinger Equation for a 2D model of Ne atom using circularly polarized fundamental with counter-rotating second harmonic laser fields. We demonstrate strong asymmetry between left- and right- circularly polarized harmonics when a ground state with p-type symmetry is used. It arises due to the circular polarization of individual attosecond pulses in the generated pulse train. Reducing the length of the counter-rotating drivers and introducing a small time-shift between them allows to generate a single elliptically polarized attosecond pulse.