Mechanisms of two-color laser-induced field-free molecular orientation

Abstract

Two mechanisms of two-color (ω+ 2ω) laser-induced field-free molecular orientation, based on the hyperpolarizability and ionization depletion, are explored and compared. The CO molecule is used as a computational example. While the hyperpolarizability mechanism generates small amounts of orientation at intensities below the ionization threshold, ionization depletion quickly becomes the dominant mechanism as soon as ionizing intensities are reached. Only the ionization mechanism leads to substantial orientation (e.g. on the order of |<cosθ>| > 0.1). For intensities typical of laser-induced molecular alignment and orientation experiments, the two mechanism lead to robust, characteristic timings of the field-free orientation wave-packet revivals relative to the the alignment revivals and the revival time. The revival timings can be used to detect the active orientation mechanism experimentally.

References in corpus (1)

• Field-free orientation of CO molecules by femtosecond two-color laser fields

Cited by in corpus (6)

• Angular Momentum Transfer in Interaction of Laguerre-Gaussian Beams with Atoms and Molecules
• Two-state wave packet for strong field-free molecular orientation
• On the observation of field-free orientation of a symmetric top molecule by terahertz laser pulses at high temperature
• High-order harmonic spectroscopy for molecular imaging of polyatomic molecules
• Shaping of the time-evolution of field-free molecular orientation by THz laser pulses
• Imaging of the umbrella motion and tunneling in the ammonia molecule by strong-field ionization