Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Laser Physics Letters

Control of multiphoton radiative recombination through the action of two low-frequency fields

Saverio Bivona, R. Burlon, G. Ferrante, C Leone

Published Feb 9, 2004• 10 citations
Publisher

Abstract

Interference effects caused by the simultaneous action of a two low frequency fields with commensurate frequencies during laser assisted radiative recombination (LARR) are investigated theoretically. Varying the relative phase of the two fields the following LARR features may be controlled: a) location of the maxima in the total emitted power; b) enhancement of the total emitted power; c) polar shape of the differential emitted power; d) shape of the emitted power spectra.

DOI
10.1002/lapl.200310034

Related papers

Phase controlled light switching at low power levels

Hoonsoo Kang, Gessler Hernandez, Jiepeng Zhang +1 more

We report experimental observations of interference between three-photon and one-photon excitations, and phase control of light attenuation/transmission in a four-level system. Either constructive interference or destructive interference can be obtained by varying the phase and/or frequency of a weak control laser. The interference enables absorptive switching of one field by another field at different frequencies and ultra-low light levels.

arXiv:quant-ph/0510036•Oct 5, 2005•0 citations

Radiative processes in a bichromatic laser field with multiple frequencies

Valery Alexandrovich Astapenko

A review of experimental and theoretical studies on radiative processes induced by a bichromatic (two-frequency) laser radiation in atoms, molecules, and solids is presented. The optical excitation of matter is considered at transitions of different types: bound—bound, bound—free, and free—free. A special attention is devoted to the possibility of the coherent control of the basic characteristics of radiative phenomena by varying the relative phase of monochromatic components of radiation. It is shown that this method opens up new possibilities for controlling photoinduced processes.

Quantum Electronics•Dec 31, 2006•16 citations

DC-field-induced resonance and polarization effects in two-colour frequency mixing in atoms

Nikolai L. Manakov, Vitalii D Ovsiannikov, Nikolai L. Manakov

In a gas of free atoms interacting with a two-colour laser radiation, a DC electric field provides the necessary conditions for generation of sum-frequency radiation, together with a resonance enhancement of the frequency conversion process. The interference between the DC-field-induced and the dipole-forbidden three-photon amplitudes causes circular dichroism effects in the scattering of the sum-frequency photons at right angles to the incident laser beams. The DC-field-induced resonance effect is strongly dependent on the frequency detuning and the width of the resonant levels.

Journal of Physics B Atomic Molecular and Optical Physics•May 16, 2000•4 citations

Two-mode multiphoton transitions

Lung Ko, Michael W. Noel, Jonathan M. Lambert +1 more

We have investigated multiphoton transitions driven by two harmonically related microwave fields in a two-level system. We observed pronounced dependence of the Rabi frequency on the amplitudes and relative phase of the fields in the low field limit and found that the Rabi frequency of the combined fields was given by the phasor sum of the Rabi frequencies of the individual fields. For strong fields, each individual Rabi frequency is modified by the presence of the other field and this intuitive phasor addition is no longer valid.

Journal of Physics B Atomic Molecular and Optical Physics•Jul 20, 1999•11 citations

Control of photodetachment through a two-color low-frequency field

Saverio Bivona, R. Burlon, C. Leone

We propose a photodetachment scheme for observing interference effects caused by the simultaneous action of a two-color low-frequency field with commensurate frequencies during the photodetachment event. By changing the relative phase of the low-frequency fields, considerable modifications are found to occur in the angular distributions of the photoelectrons as well as in their energy spectra. Some properties of the photoelectron angular distributions are discussed, and the extension of the energy spectra as a function of the low-frequency radiation parameters is evaluated.

Physical Review A•Jan 1, 1998•4 citations

Coherent phase control in electron scattering by hydrogen atoms in a bichromatic laser field

Aurelia Cionga, F. Ehlotzky, Gabriela Buică

We consider electron scattering by hydrogen atoms in a bichromatic linearly polarized laser field of frequencies ω and 3ω and we discuss the coherent control of the scattering process as a function of the relative phase φ between the two components of the radiation field. The electrons are assumed to have sufficiently high energies in order to permit the description of the scattering process in the first-order Born approximation. The scattered electrons, embedded in the bichromatic laser field of moderate power, as well as the laser dressing of the hydrogen atoms in their ground state are described by time-dependent perturbation theory. We discuss the angular dependence of the nonlinear differential scattering cross sections for the low values N = ±2 of absorbed or emitted laser photons as a function of the relative phase φ between the two radiation field components. We also compare our results with those obtained from the assumption of a static potential describing the target atom.

Journal of Physics B Atomic Molecular and Optical Physics•May 4, 2001•9 citations
Interference effects caused by the simultaneous action of a two low frequency fields with commensurate frequencies during laser assisted radiative recombination (LARR) are investigated theoretically. Varying the relative phase of the two fields the following LARR features may be controlled: a) location of the maxima in the total emitted power; b) enhancement of the total emitted power; c) polar shape of the differential emitted power; d) shape of the emitted power spectra.
A review of experimental and theoretical studies on radiative processes induced by a bichromatic (two-frequency) laser radiation in atoms, molecules, and solids is presented. The optical excitation of matter is considered at transitions of different types: bound—bound, bound—free, and free—free. A special attention is devoted to the possibility of the coherent control of the basic characteristics of radiative phenomena by varying the relative phase of monochromatic components of radiation. It is shown that this method opens up new possibilities for controlling photoinduced processes.
In a gas of free atoms interacting with a two-colour laser radiation, a DC electric field provides the necessary conditions for generation of sum-frequency radiation, together with a resonance enhancement of the frequency conversion process. The interference between the DC-field-induced and the dipole-forbidden three-photon amplitudes causes circular dichroism effects in the scattering of the sum-frequency photons at right angles to the incident laser beams. The DC-field-induced resonance effect is strongly dependent on the frequency detuning and the width of the resonant levels.
We have investigated multiphoton transitions driven by two harmonically related microwave fields in a two-level system. We observed pronounced dependence of the Rabi frequency on the amplitudes and relative phase of the fields in the low field limit and found that the Rabi frequency of the combined fields was given by the phasor sum of the Rabi frequencies of the individual fields. For strong fields, each individual Rabi frequency is modified by the presence of the other field and this intuitive phasor addition is no longer valid.
We propose a photodetachment scheme for observing interference effects caused by the simultaneous action of a two-color low-frequency field with commensurate frequencies during the photodetachment event. By changing the relative phase of the low-frequency fields, considerable modifications are found to occur in the angular distributions of the photoelectrons as well as in their energy spectra. Some properties of the photoelectron angular distributions are discussed, and the extension of the energy spectra as a function of the low-frequency radiation parameters is evaluated.
We consider electron scattering by hydrogen atoms in a bichromatic linearly polarized laser field of frequencies ω and 3ω and we discuss the coherent control of the scattering process as a function of the relative phase φ between the two components of the radiation field. The electrons are assumed to have sufficiently high energies in order to permit the description of the scattering process in the first-order Born approximation. The scattered electrons, embedded in the bichromatic laser field of moderate power, as well as the laser dressing of the hydrogen atoms in their ground state are described by time-dependent perturbation theory. We discuss the angular dependence of the nonlinear differential scattering cross sections for the low values N = ±2 of absorbed or emitted laser photons as a function of the relative phase φ between the two radiation field components. We also compare our results with those obtained from the assumption of a static potential describing the target atom.