High-order harmonic generation in polyatomic molecules induced by a bicircular laser field

Abstract

High-order harmonic generation by a bicircular field, which consists of two coplanar counter-rotating circularly polarized fields of frequency $r\omega$ and $s\omega$ ($r$ and $s$ are integers), is investigated for a polyatomic molecule. This field possesses dynamical symmetry, which can be adjusted to the symmetry of the molecular Hamiltonian and used to investigate the molecular symmetry. For polyatomic molecules having the $C_{r+s}$ symmetry only the harmonics $n=q(r+s)\pm r$, $q=1,2,\dots$, are emitted having the ellipticity ${\epsilon }_n=\pm 1$. We illustrate this using the example of the planar molecules BH${}_3$ and BF${}_3$, which obey the $C_3$ symmetry. We show that for the BF${}_3$ molecule, similarly to atoms with a $p$ ground state, there is a strong asymmetry in the emission of high harmonics with opposite helicities. This asymmetry depends on the molecular orientation.

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Cited by in corpus (3)

• Control of attosecond light polarization in two-color bi-circular fields
• Time-resolved high harmonic spectroscopy of dynamical symmetry breaking in bi-circular laser fields
• Signatures of electronic structure in bi-circular high-harmonic spectroscopy