2014
DOI: 10.1103/physrevlett.113.023001
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Two-Pulse Field-Free Orientation Reveals Anisotropy of Molecular Shape Resonance

Abstract: 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 a one-color (ω) and a two-color (ω + 2ω) non-resonant 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 applications. The a… Show more

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Cited by 92 publications
(83 citation statements)
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“…Note that a larger degree of orientation can be achieved with the two-color mechanisms through ionization depletion [53]. In this second regime, molecular orientation has been recently addressed experimentally for linear molecules using only a THz field [54] or its combination with a laser field [55], and in [56,57] for an excitation process with two-color laser fields.…”
Section: Introductionmentioning
confidence: 99%
“…Note that a larger degree of orientation can be achieved with the two-color mechanisms through ionization depletion [53]. In this second regime, molecular orientation has been recently addressed experimentally for linear molecules using only a THz field [54] or its combination with a laser field [55], and in [56,57] for an excitation process with two-color laser fields.…”
Section: Introductionmentioning
confidence: 99%
“…High-harmonic generation from a linearly polarized driver is sensitive to inversion symmetry, the breaking of which leads to emission of even harmonics [15,16] that characterize the time-dependent electronic asymmetry of the studied sample [14,17]. In this Letter, we generalize the sensitivity of HHS to rotational symmetries of atoms and molecules and their time-dependent breaking by introducing bicircular HHS (BHHS), driven by a circularly polarized fundamental field of frequency ω and its counterrotating second harmonic 2ω.…”
mentioning
confidence: 99%
“…Such a scheme has been proposed before; for example, in Refs. [47][48][49], where it is used to enhance molecular alignment and orientation. Furthermore, it should be possible to extend the method to the case when the target is prepared in electronically excited states, in particular dissociating or predissociating states, in which the nuclear wave packet experiences significant dynamical changes.…”
Section: Discussionmentioning
confidence: 99%