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

  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},
  volume={113 2},
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… 

Figures from this paper

Field-free molecular orientation by delay- and polarization-optimized two fs pulses
This study shows that the alignment and orientation can be very well synchronized temporally because the crossed field does not disturb the preformed alignment modulation significantly, suggesting that the molecules are very well confined in the laboratory frame.
Probing the field-free orientation dynamics of polar molecules using laser-induced THz wave generation
ABSTRACT Here, we propose a novel approach to probing the field-free orientation dynamics of an ensemble of polar molecules. This approach implies the measurement of the THz signal produced in a
Observation of laser-induced electronic structure in oriented polyatomic molecules
This work uses high-harmonic spectroscopy to measure laser-induced modifications of the electronic structure of molecules and shows that these robust observables reveal a substantial modification of the molecular electronic structure by the external laser field.
Comparative studies of the degrees of orientation of CO molecules pumped by intense femtosecond two-color pulses based on high-order harmonic generation and Coulomb explosion imaging
With an intense femtosecond two-color pulse optimized for the generation of even-order harmonics from CO molecules, we directly measure the actual degrees of orientation by utilizing the Coulomb
Enhancement and suppression of field-free molecular orientation with two ultrashort pulses
Abstract The field-free molecular orientation induced by two half-cycle pulses is investigated systematically. In addition to the structure parameters of the pulses, the polarization direction and
Attosecond imaging of molecules using high harmonic spectroscopy
The availability of attosecond-duration extreme ultraviolet or soft X-ray light sources has opened up new fields of research in atomic and molecular physics. These pulses can be as short as 50 as,
Time-dependent analysis of the mixed-field orientation of molecules without rotational symmetry.
A theoretical study of the mixed-field orientation of molecules without rotational symmetry and predicts that using elliptically polarized laser fields or strong dc fields, three-dimensional orientation is obtained.