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Efficient field-free orientation of CO molecules using a three-step excitation scheme

  • Yin Huang
  • Ting Xie
  • Gao-Ren Wang
  • Yong-Chang Han
  • Shu-Lin Cong
Regular Article

Abstract

An efficient three-step excitation scheme is proposed to achieve the strong molecular orientation. By taking the CO molecule for example, via the Raman excitation by the femtosecond pulse L 1 and subsequently resonant excitations by a single-cycle THz pulse L 2, the high degree of the field-free orientation of |⟨ cosθ ⟩ |max = 0.8921 can be obtained at the rotational temperature T = 0 K. An additional single-cycle THz pulse L 3 is introduced to further regulate the population distribution on rotational states and decrease the reduction of the orientation originating from the offset phase. With the increase of the central frequency ω 3 of L 3, the optimal |⟨ cosθ ⟩ |max increases monotonically. When ω 3 = 1.0 THz, the degree of the field-free orientation reaches |⟨ cosθ ⟩ |max = 0.9401. Moreover, our scheme is robust against the rotational temperature. Although the molecular orientation weakens with the rise of rotational temperature, |⟨ ⟨ cosθ ⟩ ⟩ | > 0.5 is still obtained until T = 22.8 K.

Keywords

Ultraintense and Ultra-short Laser Fields 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Yin Huang
    • 1
  • Ting Xie
    • 1
  • Gao-Ren Wang
    • 1
  • Yong-Chang Han
    • 1
  • Shu-Lin Cong
    • 1
  1. 1.School of Physics and Optoelectronic TechnologyDalian University of TechnologyDalianP.R. China

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