Journal
PHYSICAL REVIEW A
Volume 94, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.94.013855
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Funding
- Russian Foundation for Basic Research (RFBR Grants) [15-02-04352, 16-32-00723]
- ERC X-five [339128]
- French Agence Nationale de la Recherche (ANR) [NT09491966]
- European Research Council (ERC) [339128] Funding Source: European Research Council (ERC)
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Recently several techniques demonstrated the production of elliptically polarized high harmonics. One of these techniques consists of the interaction in a noble gas of two-color laser beams having orthogonal linear polarizations. Here we present the theoretical explanation of such a result observed in Lambert et al. [Nat. Commun. 6, 6167 (2015)]. Numerical calculations based on the nonperturbative light-atom interaction theory reproduce well the experimental data. The degree of polarization is analyzed for different harmonic orders and found to be high. With the help of a simplified theoretical model it is shown that the degree of harmonic ellipticity depends mainly on the population of atomic state sublevels with different angular momentum projections.
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