Visualizing coherent molecular rotation in a gaseous medium

Inducing and controlling the ultrafast molecular rotational dynamics using shaped laser fields is essential in numerous applications. Several approaches exist that allow following the coherent molecular motion in real-time, including Coulomb explosion-based techniques and recovering molecular orient...

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Bibliographic Details
Published in:arXiv.org 2021-09
Main Authors: Tutunnikov, Ilia, Prost, Emilien, Steinitz, Uri, Béjot, Pierre, Hertz, Edouard, Billard, Franck, Faucher, Olivier, Ilya Sh Averbukh
Format: Article
Language:English
Subjects:
Angular distribution
Chain dynamics
Circular polarization
Image transmission
Lasers
Linear polarization
Molecular gases
Molecular motion
Molecular rotation
Wave plates
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Summary:Inducing and controlling the ultrafast molecular rotational dynamics using shaped laser fields is essential in numerous applications. Several approaches exist that allow following the coherent molecular motion in real-time, including Coulomb explosion-based techniques and recovering molecular orientation from the angular distribution of high harmonics. We theoretically consider a non-intrusive optical scheme for visualizing the rotational dynamics in an anisotropic molecular gas. The proposed method allows determining the instantaneous orientation of the principal optical axes of the gas. The method is based on probing the sample using ultra-short circularly polarized laser pulses and recording the transmission image through a vortex wave plate. We consider two example excitations: molecular alignment induced by an intense linearly polarized laser pulse and unidirectional molecular rotation induced by a polarization-shaped pulse. The proposed optical method is promising for visualizing the dynamics of complex symmetric- and asymmetric-top molecules.
ISSN:2331-8422
DOI:10.48550/arxiv.2109.11494