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

@article{Odvzak2016HighorderHG,
  title={High-order harmonic generation in polyatomic molecules induced by a bicircular laser field},
  author={Senad Odvzak and Elvedin Hasovi'c and Dejan B. Milovsevi'c},
  journal={Physical Review A},
  year={2016},
  volume={94},
  pages={033419}
}
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,\ldots… 

Figures and Tables from this paper

Molecules in a bicircular strong laser field
Strong-field ionization of nonlinear planar triatomic molecules by a bicircular laser field is analyzed within the improved molecular strong-field approximation. Our calculations include additional
High-order harmonic generation by planar polyatomic molecules exposed to an orthogonally polarized two-color laser field
The molecular strong-field approximation is employed to study high-order harmonic generation by linear and planar polyatomic molecules exposed to an orthogonally polarized two-color laser field,
High-order harmonic generation in non-planar molecules driven by a bicircular field
ABSTRACT We investigate high-order harmonic generation of non-planar ammonia molecules by a bicircular field, which consists of two coplanar counter-rotating circularly polarised fields of
High-order harmonic generation from H2+ irradiated by a co-rotating two-color circularly polarized laser field
The high-order harmonic generation process of ${\mathrm{H}}_{2}{}^{+}$ in a co-rotating two-color circularly polarized laser pulse was investigated by numerically solving the time-dependent
Probing atomic and molecular targets by intense bicircular counter-rotating laser fields
We present an ab initio study of strong-field ionization of H and H 2 + by two-colour bicircular counter-rotating 1ω–2ω laser pulses containing two and ten optical cycles at the fundamental frequency
Ellipticity of High-Order Harmonics Generated by Aligned Homonuclear Diatomic Molecules Exposed to an Orthogonal Two-Color Laser Field
We investigate emission rate and ellipticity of high-order harmonics generated exposing a homonuclear diatomic molecule, aligned in the laser-field polarization plane, to a strong orthogonally
Time-resolved high harmonic spectroscopy of dynamical symmetry breaking in bi-circular laser fields: the role of Rydberg states.
TLDR
It is demonstrated that when the second harmonic either precedes or is more intense than the fundamental field, the weak effects of dynamical symmetry breaking caused by finite pulse duration are amplified by electrons trapped in Rydberg orbits (i.e., Freeman resonances), and that the forbidden harmonic lines are a witness of this.
Revealing dynamical symmetries by bicircular high-harmonic spectroscopy beyond the Born-Oppenheimer approximation
We explore the possibility of bicircular high-harmonic spectroscopy to probe the laser-induced dynamics of molecules in a non-Born-Oppenheimer treatment. The numerical solutions of the timedependent
Probing dynamical symmetries by bicircular high-order harmonic spectroscopy beyond the Born-Oppenheimer approximation
We explore the possibility of bicircular high-order harmonic spectroscopy to probe the laser-induced dynamics of molecules in a non-Born-Oppenheimer treatment. The numerical solutions of the
Atomic and Molecular Processes in a Strong Bicircular Laser Field
With the development of intense femtosecond laser sources it has become possible to study atomic and molecular processes on their own subfemtosecond time scale. Table-top setups are available that
...
...

References

SHOWING 1-10 OF 62 REFERENCES
Dynamical symmetries and harmonic generation
We discuss harmonic generation in the case of laser field-dressed Hamiltonians that are invariant under so-called dynamical symmetry operations. Examples for such systems are molecules which exhibit
Circularly polarized molecular high harmonic generation using a bicircular laser
We investigate the process of circularly polarized high harmonic generation in molecules using a bicircular laser field. In this context, we show that molecules offer a very robust framework for the
Possibility of introducing spin into attoscience with spin-polarized electrons produced by a bichromatic circularly polarized laser field
We show that the electrons, produced in strong-bicircular-field-induced above-threshold ionization of inert-gas atoms, have a large spin asymmetry if the ions exhibit fine-structure splitting. For a
High-order harmonic generation of N2 molecule in two-color circularly polarized laser fields*
The generation of high-order harmonics and the attosecond pulse of the N2 molecule in two-color circularly polarized laser fields are investigated by the strong-field Lewenstein model. We show that
High-order harmonic generation by a bichromatic elliptically polarized field: conservation of angular momentum
We present a theory of high-order harmonic generation by a bichromatic elliptically polarized laser field which consists of two coplanar components having the frequencies and (r and s are integers)
Controlling harmonic generation in molecules with intense laser and static magnetic fields: Orientation effects
We solve exactly the three-dimensional time-dependent Schroedinger equation for the H{sub 2}{sup +} molecular ion in a combination of intense short laser pulses and static magnetic fields using a
Probing Orbital Structure of Polyatomic Molecules by High-order Harmonic Generation
  • R. Torres, N. Kajumba, J. Marangos
  • Physics, Chemistry
    2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference
  • 2007
TLDR
High-order harmonic emission is observed in acetylene and allene molecules with 14 fs laser pulses producing a time dependent modulation of the harmonic signal as the ensemble undergoes the subsequent alignment revivals.
Bicircular High-Harmonic Spectroscopy Reveals Dynamical Symmetries of Atoms and Molecules.
TLDR
It is shown that breaking the threefold rotational symmetry of the generating medium results in the emission of the otherwise parity-forbidden frequencies 3qω  (q∈N), which provide a background-free probe of dynamical molecular symmetries.
Signatures of symmetry and electronic structure in high-order harmonic generation in polyatomic molecules
We report detailed measurements of high-order harmonic generation in chloromethane molecules (CCl{sub 4}, CHCl{sub 3}, and CH{sub 2}Cl{sub 2}) to show that fingerprints of symmetry and electronic
Observation of laser-induced electronic structure in oriented polyatomic molecules
TLDR
This work uses high-harmonic spectroscopy to measure laser-induced modifications of the electronic structure of molecules and shows that these robust observables reveal a substantial modification of the molecular electronic structure by the external laser field.
...
...