Abstract
Using the molecular strong-field approximation, we investigate high-order harmonic generation by heteronuclear diatomic molecules exposed to an orthogonally polarized two-color laser field, which consists of two mutually orthogonal linearly polarized fields with frequencies \(r\omega \) and \(s\omega \). Here, r and s are integers and \(\omega \) is the fundamental frequency. The harmonic emission rate and the harmonic ellipticity can be controlled using the laser-field parameters, in particular the relative phase and the intensity ratio of the laser-field components. The value of the relative phase, for which the emission rate is optimal, and the position of the cutoff can be estimated using a classical model. Also, we analyze the harmonic emission rate and the harmonic ellipticity as functions of the molecular orientation, which can also be used as a control parameter. Two types of minima are present in the spectra, depending on r and s. For \(r+s\) even, interference minima are present in the spectra of the T-matrix component either parallel or perpendicular to the internuclear axis. Using quantum-orbit theory and the saddle-point method, we derive a condition for the interference minima, which relates the molecular orientation angle \(\theta _L\) and the harmonic order n. The corresponding curves in the (\(\theta _L\), n) plane well reproduce the minima of the numerically calculated spectra. For \(r+s\) odd, minima are present in the spectra for a particular molecular orientation angle. These minima are explained using the explicit form of the T-matrix element. A heteronuclear as opposed to a homonuclear molecule affords a larger region in the parameter space where both the harmonic ellipticity and the harmonic intensity vary smoothly and both are large.
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Data Availibility Statement
This manuscript has no associated data or the data will not be deposited [Authors’ comment: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.]
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We gratefully acknowledge support by the Ministry for Education, Science and Youth Canton Sarajevo, Bosnia and Herzegovina, and the Alexander von Humboldt Foundation.
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Habibović, D., Becker, W. & Milošević, D.B. High-order harmonic generation by aligned heteronuclear diatomic molecules in an orthogonally polarized two-color laser field. Eur. Phys. J. D 75, 122 (2021). https://doi.org/10.1140/epjd/s10053-021-00133-4
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DOI: https://doi.org/10.1140/epjd/s10053-021-00133-4