Two-pulse field-free orientation reveals anisotropy of molecular shape resonance.

@article{Kraus2014TwopulseFO,
  title={Two-pulse field-free orientation reveals anisotropy of molecular shape resonance.},
  author={Peter M. Kraus and Denitsa Baykusheva and Hans Jakob W{\"o}rner},
  journal={Physical review letters},
  year={2014},
  volume={113 2},
  pages={
          023001
        }
}
We report the observation of macroscopic field-free orientation, i.e., more than 73% of CO molecules pointing in the same direction. This is achieved through an all-optical scheme operating at high particle densities (>10(17)  cm(-3)) that combines one-color (ω) and two-color (ω+2ω) nonresonant femtosecond laser pulses. We show that the achieved orientation solely relies on the hyperpolarizability interaction as opposed to an ionization-depletion mechanism, thus, opening a wide range of… 

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