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

Journal Article · Thu Dec 15 04:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.065401· OSTI ID:22095747

Yun, Hyeok; Nam, Chang Hee ^[1]; Kim, Hyung Taek; Kim, Chul Min; Lee, Jongmin ^[2]

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1. Department of Physics and Coherent X-ray Research Center, KAIST, Yusong-gu, Daejon 305-701 (Korea, Republic of)
2. Advanced Photonics Research Institute, GIST, 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712 (Korea, Republic of)

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.

• OSTI ID: 22095747
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ASYMMETRY
COLOR
EXCITATION
LASER RADIATION
MOLECULES
ORIENTATION
P INVARIANCE
PARITY
POLARIZABILITY
ROTATIONAL STATES