Journal
PHYSICAL REVIEW A
Volume 100, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.100.033410
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Funding
- National Natural Science Foundation of China [11674363, 91850121]
- Science Fund of Educational Department of Henan Province of China [2011C140001]
- Ninth Group of Key Disciplines in Henan Province [2018119]
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The polarization of high-order harmonic generation in H-2(+) driven by a counterrotating bichromatic omega/3 omega circularly polarized laser field is investigated theoretically. The elliptically polarized harmonics are characterized by ellipticity and rotation angle, where the latter is expanded to [-pi/2, pi/2] by an optimized definition. We find a critical alignment angle where the ellipticity of high-energy harmonics is almost the same, so an attosecond pulse train with a high degree of polarization can be synthesized. In addition, we find that the rotation angle is always different from the alignment angle by 90 degrees with a small deflection. Thus, we propose a scheme to control the harmonic polarization state by the molecular alignment angle.
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