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

Journal of Physics B Atomic Molecular and Optical Physics

Wavelet temporal profile of high-order harmonics emitted by a two-level atom in the presence of a laser pulse

Salvatore De Luca, Emilio Fiordilino

Published Jul 28, 1996• 25 citations
Publisher

Abstract

The acceleration of the electron in a two-level atom driven by a short laser pulse of intermediate strength is calculated and therefore analysed through two wavelet transforms in order to obtain the temporal evolution of the spectrum of the emitted radiation. We show (i) the full spectrum at different instants and (ii) the time profile of some representative harmonics. The growth of the harmonics as well as the appearance and erratic behaviour of the hyper-Raman can be followed with the laser intensity.

DOI
10.1088/0953-4075/29/14/031

Related papers

Wavelet analysis of short harmonics generated in presence of a two colour laser field

Salvatore De Luca, Emilio Fiordilino

The Morlet wavelet spectrum of the radiation emitted by a two level atom in presence of two laser pulses with very close frequency is obtained. The wavelet spectrum gives information on the time evolution of the full spectrum and of a particular line. The beating condition stimulates the atom to emit pulses of harmonics with duration of the order of a few optical cycles of the pumping radiation. Pulse trains of 3 optical cycles (FWHM) are observed.

Journal of Modern Optics•Sep 1, 1998•13 citations

Time profile of harmonics generated by a single atom in a strong electromagnetic field

Philippe Antoine, Bernard Piraux, A. Maquet

It is well established, both experimentally and theoretically, that atoms exposed to a strong laser pulse emit high order harmonics of the driving field. Although this process has been intensively studied theoretically, the main effort has been focused so far on the study of the harmonic spectrum while no attempt has been made to analyse systematically its time evolution. We show that the time profile of each harmonic may be obtained through a time-frequency analysis of the acceleration of the atomic dipole. We show also that such an analysis, which is very sensitive to the details of the dynamics, provides valuable information about the competition between photon emission and ionization processes.

High Field Interactions and Short Wavelength Generation•Jan 1, 1994•6 citations

Temporal evolution of the spectrum emitted by a two-level atom in the presence of a laser field

Emilio Fiordilino, Vincenzo Miceli

The temporal evolution of the spectrum emitted by a two level atom irradiated by a laser pulse is obtained by means of the Gabor transform of the acceleration of the electron. This transform is useful in revealing fine structures of the spectrum which are otherwise invisible.

Journal of Modern Optics•Apr 1, 1996•8 citations

Analytical study of the spectrum emitted by a two-level atom driven by a strong laser pulse

ANTONINO DI PIAZZA, Emilio Fiordilino, Marvin H. Mittleman

The wave function of a two-level atom driven by a low-frequency laser pulse is obtained in analytical form and is used to determine the power spectrum of the dipole moment of the atom for different initial atomic states. The solution goes over some known approximate solutions and gives the energy of the two dressed states, the position of the hyper-Raman lines, the amplitudes both of the hyper-Raman lines and of the odd harmonics, and the position of the cutoff. The form of the hyper-Raman spectrum results independently of the initial atomic state and shows an onset and a cutoff of the emission.

Physical Review A•Jun 11, 2001•28 citations

Laser Pulse Shape Effects in Harmonic Generation from a Two-level Atom

Emilio Fiordilino, Vincenzo Miceli

The harmonic spectrum emitted by a two-level atom driven by a resonant laser field is calculated. The spectrum is seen to depend on the shape of the pulse. In the case of an asymmetric pulse profile, harmonic emission is present also at a relatively low intensity field.

Journal of Modern Optics•Jul 1, 1994•23 citations

High-order harmonic emission from a three-level atom in a laser field

Pasquale Caldara, Emilio Fiordilino

The spectrum emitted by a three-level atom in the presence of a weak laser field is given together with the population dynamics and the phase of the Fourier transform of the acceleration. Calculations show that the spectrum can be very different from that emitted by a two-level atom. When the trapping conditions are obtained, the coupling to the third level can result in a large change in the spectrum.

Journal of Modern Optics•Apr 1, 1999•6 citations
The acceleration of the electron in a two-level atom driven by a short laser pulse of intermediate strength is calculated and therefore analysed through two wavelet transforms in order to obtain the temporal evolution of the spectrum of the emitted radiation. We show (i) the full spectrum at different instants and (ii) the time profile of some representative harmonics. The growth of the harmonics as well as the appearance and erratic behaviour of the hyper-Raman can be followed with the laser intensity.
It is well established, both experimentally and theoretically, that atoms exposed to a strong laser pulse emit high order harmonics of the driving field. Although this process has been intensively studied theoretically, the main effort has been focused so far on the study of the harmonic spectrum while no attempt has been made to analyse systematically its time evolution. We show that the time profile of each harmonic may be obtained through a time-frequency analysis of the acceleration of the atomic dipole. We show also that such an analysis, which is very sensitive to the details of the dynamics, provides valuable information about the competition between photon emission and ionization processes.
The wave function of a two-level atom driven by a low-frequency laser pulse is obtained in analytical form and is used to determine the power spectrum of the dipole moment of the atom for different initial atomic states. The solution goes over some known approximate solutions and gives the energy of the two dressed states, the position of the hyper-Raman lines, the amplitudes both of the hyper-Raman lines and of the odd harmonics, and the position of the cutoff. The form of the hyper-Raman spectrum results independently of the initial atomic state and shows an onset and a cutoff of the emission.