Article Dans Une Revue Physical Review A Année : 2021

Visualizing coherent molecular rotation in a gaseous medium

Résumé

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 nonintrusive 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 ultrashort 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.
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hal-03461780 , version 1 (09-01-2025)

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Ilia Tutunnikov, Emilien Prost, Uri Steinitz, Pierre Béjot, Edouard Hertz, et al.. Visualizing coherent molecular rotation in a gaseous medium. Physical Review A, 2021, 104 (5), pp.053113. ⟨10.1103/PhysRevA.104.053113⟩. ⟨hal-03461780⟩
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