Probing the origin of elliptical high-order harmonic generation from aligned molecules in linearly polarized laser fields

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Issue Date
2010-10-18Author
Son, Sang-Kil
Telnov, Dmitry A.
Chu, Shih-I
Publisher
American Physical Society
Type
Article
Article Version
Scholarly/refereed, publisher version
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Show full item recordAbstract
A recent experiment [Phys. Rev. Lett. 102, 073902 (2009)] has demonstrated that elliptically polarized high-order harmonic generation can be produced from linearly polarized driving fields for aligned molecular systems. In order to reveal the underlying physical mechanisms of elliptical harmonics, we present fully ab initio and high-precision calculations and analyses of the amplitude, phase, and polarization state of the harmonic radiation from molecular hydrogen ions with arbitrary orientation. We find that high ellipticity arises from molecular orbital symmetry and two-center interference effects. Our ab initio exploration and findings lead to a general rule that the ellipticity becomes high for molecular orbitals represented by a symmetric combination of atomic orbitals, whereas it becomes low for molecular orbitals represented by an antisymmetric combination. This finding also applies to the general case of aligned linear molecules.
Description
This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.82.043829.
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Citation
Son, Sang-Kil., Telnov, Dmitry A., Chu, Shih-I. "Probing the origin of elliptical high-order harmonic generation from aligned molecules in linearly polarized laser fields." Phys. Rev. A 82, 043829 – Published 18 October 2010. http://dx.doi.org/10.1103/PhysRevA.82.043829.
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