Visualizing complex-amplitude assembly in high-order harmonic generation from oriented polar molecules.

Authors

Tianqi Ruan, Chaojin Zhang, Lihao Weng, Chengpu Liu, Xiaohong Song, Weifeng Yang

Published in

Optics letters. Volume 51. Issue 21. Pages 6070-6073. Nov 01, 2026. Epub Oct 06, 2026.

Abstract

Polarization-resolved high-order harmonic generation from oriented polar molecules encodes electron recollision from opposite molecular directions, yet the underlying interference is hidden in intensity spectra. Here we decompose the polarization-resolved harmonic response of carbon monoxide molecules into four ionization-recombination amplitudes associated with the carbon and oxygen centers. The calculated spectra reproduce the established odd-even polarization pattern and reveal distinct orientation-dependent behavior for neighboring harmonics near the cutoff. Molecular rotation converts destructive interference into phase locking of the carbon-ionization amplitudes for the even harmonic, whereas increasing phase competition suppresses the neighboring odd harmonic. This contrast is manifested in the orientation-dependent polarized yields, the polarization imbalance, and the contrasting activation and suppression of neighboring harmonics, providing experimentally accessible signatures of microscopic interference in oriented polar molecules.

PMID:
42962125
Bibliographic data and abstract were imported from PubMed on 31 Oct 2026.

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