Publication:
High-order harmonic generation by aligned heteronuclear diatomic molecules in an orthogonally polarized two-color laser field

Дата
2021
Авторы
Habibovic, D.
Milosevic, D. B.
Becker, W.
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Научные группы
Организационные подразделения
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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© 2021, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.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 rω and sω. Here, r and s are integers and ω 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 θL and the harmonic order n. The corresponding curves in the (θL, 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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Habibovic, D. High-order harmonic generation by aligned heteronuclear diatomic molecules in an orthogonally polarized two-color laser field / Habibovic, D., Milosevic, D.B., Becker, W. // European Physical Journal D. - 2021. - 75. - № 4. - 10.1140/epjd/s10053-021-00133-4
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https://www.doi.org/10.1140/epjd/s10053-021-00133-4
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85104052036&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000638599600001
 https://openrepository.mephi.ru/handle/123456789/23895
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