Parity-selective enhancement of field-free molecular orientation in an intense two-color laser field

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We investigated the characteristics of molecular orientation induced by a nonresonant two-color femtosecond laser field. By analyzing the rotational dynamics of asymmetric linear molecules, we revealed that the critical parameter in characterizing the molecular orientation was the hyperpolarizability of molecules that selected the excitation paths of rotational states between parity-changing and parity-conserving transitions. Especially, in the case of molecules with small hyperpolarizability, a significant enhancement of orientation was achieved at the half-rotational period, instead of the full-rotational period. This deeper understanding of the hyperpolarizability-dependent characteristics of molecular orientation in a two-color scheme can provide an effective method to achieve significantly enhanced field-free orientation for various polar molecules.
Publisher
AMER PHYSICAL SOC
Issue Date
2011-12
Language
English
Article Type
Article
Keywords

HYPERPOLARIZABILITY

Citation

PHYSICAL REVIEW A, v.84, no.6

ISSN
1050-2947
URI
http://hdl.handle.net/10203/95983
Appears in Collection
PH-Journal Papers(저널논문)
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