Abstract
We study high-order harmonic generation (HHG) from aligned molecules in strong elliptically polarized laser fields numerically and analytically. Our simulations show that the spectra and polarization of HHG depend strongly on the molecular alignment and the laser ellipticity. In particular, for small laser ellipticity, large ellipticity of harmonics with high intensity is observed for parallel alignment, along with forming a striking ellipticity hump around the threshold. We show that the interplay of the molecular structure and two-dimensional electron motion plays an important role here. This phenomenon can be used to generate bright elliptically polarized extreme ultraviolet pulses.
- Received 15 January 2021
- Revised 20 April 2021
- Accepted 21 April 2021
DOI:https://doi.org/10.1103/PhysRevA.103.053108
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