Effect of ionization asymmetry on high harmonic generation from oriented CO in orthogonal twocolor fields
Abstract
We investigate the high harmonic generation from oriented CO molecules in orthogonal twocolor (OTC) fields by solving the threedimensional timedependent HartreeFock equation. The infrared fundamental laser pulse with frequency ω polarized along the molecular axis drives the harmonic generation process, while a weak second harmonic field with frequency ω_{1} = 2ω perturbs the electron dynamics along the direction perpendicular to molecular axis. We observe noninteger order harmonics of ω_{1} generated from CO with its polarization perpendicular to the molecular axis, which differs from aligned H_{2} under the same laser fields. Combining the Lewenstein model with the classical electronic trajectory analysis, we find the ionization asymmetry along molecular axis in polar molecules under the cross modulation of the OTC fields results in the difference of high harmonics between CO and H_{2}.
 Publication:

Journal of Physics B Atomic Molecular Physics
 Pub Date:
 July 2021
 DOI:
 10.1088/13616455/ac17fc
 Bibcode:
 2021JPhB...54n4009Y
 Keywords:

 high harmonic generation;
 twocolor laser;
 polar molecules;
 TDHF;
 CO