Controlling electron quantum paths for generation of circularly polarized high-order harmonics by H2+ subject to tailored (ω, 2ω) counter-rotating laser fields

John Heslar, Dmitry A. Telnov, Shih I. Chu

Research output

9 Citations (Scopus)

Abstract

Recently, studies of high-order harmonics (HHG) from atoms driven by bichromatic counter-rotating circularly polarized laser fields as a source of coherent circularly polarized extreme ultraviolet (XUV) and soft-x-ray beams in a tabletop-scale setup have received considerable attention. Here, we demonstrate the ability to control the electron recollisions giving three returns per one cycle of the fundamental frequency ω by using tailored bichromatic (ω, 2ω) counter-rotating circularly polarized laser fields with a molecular target. The full control of the electronic pathway is first analyzed by a classical trajectory analysis and then extended to a detailed quantum study of H2+ molecules in bichromatic (ω, 2ω) counter-rotating circularly polarized laser fields. The radiation spectrum contains doublets of left- and right-circularly polarized harmonics in the XUV ranges. We study in detail the below-, near-, and above-threshold harmonic regions and describe how excited-state resonances alter the ellipticity and phase of the generated harmonic peaks.

Original languageEnglish
Article number043419
Number of pages9
JournalPhysical Review A
Volume97
Issue number4
DOIs
Publication statusPublished - 18 Apr 2018

Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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