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Le Journal de Physique Colloques

LASER INDUCED COLLISIONAL ENERGY TRANSFER : HIGH RESOLUTION STUDIES AND COHERENCE EFFECTS IN DIPOLE-DIPOLE INTERACTION

Catherine Bréchignac, Ph. Cahuzac, Anne Débarre

Published Jan 1, 1985• 0 citations
Publisher

Abstract

Two complementary methods have been used to investigate light induced collisional energy transfers for a dipole-dipole interaction. A high resolution spectral profile study in a Na-Ca mixture has confirmed the assumption of a universal profile for a given interaction, the measurement of polarization ratios in a Eu-Sr mixture has confirmed the assumption that such processes may partially preserve the coherences induced by an external polarized field.

DOI
10.1051/jphyscol:1985110

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Optics Express•Sep 21, 2010•5 citations
Two complementary methods have been used to investigate light induced collisional energy transfers for a dipole-dipole interaction. A high resolution spectral profile study in a Na-Ca mixture has confirmed the assumption of a universal profile for a given interaction, the measurement of polarization ratios in a Eu-Sr mixture has confirmed the assumption that such processes may partially preserve the coherences induced by an external polarized field.
High-resolution spectra of laser-induced collisional energy transfer between europium and strontium are obtained for collisional interactions which are dipole-dipole in nature. A universal profile is found for this laser-induced excitation. For the first time a precise comparison with available calculations is possible. The line core agrees well with a theory assuming a dipole-dipole coupling, but the quasistatic wing deviates from the asymptotic behavior expected for a pure dipole-dipole interaction.
An experimental study of laser-induced collisional energy transfer in a mixture of europium and strontium vapors is reported. The profile of the excitation spectrum in the static wing has been measured with high accuracy and compared with available calculations, demonstrating that simple two-level models are inadequate to describe the transfer process. A comparison with the predictions of a three-level model assuming dipole-dipole interaction, recently developed by Bambini and Berman, shows for the first time agreement between theory and experiment.
We report a measurement of the excitation spectrum of the laser-induced collisional energy transfer process for the Eu-Sr system in the weak-field regime. The measurement has been performed in a detuning range extending up to 85 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ in the static wing, providing a wider check of existing theoretical models. The frequency resolution of the measurement (0.1 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$) was suitable for a quantitative study of the core of the line spectrum, where a comparison with the results of numerical calculations based on an effective three-level model gives complete evidence for a cooperative decay from the Sr(5p2{\mathit{p}}^{2}p2)1{)}^{1})1D2{\mathit{D}}_{2}D2​ final level.
A three-state model for calculating the cross section of laser-induced dipole-quadrupole collisional energy transfer in Sr-Ca system is presented. The motion equations for the probability amplitudes of the three intermediate states are obtained. The expression of the cross section is derived. Various factors including field intensity, relative speed, system temperature which influence the collisional cross section are discussed to illustrate the features of the dipole-quadrupole laser-induced collisional energy transfer (LICET)process. Calculating results show that the peak of the LICET profiles moves to the red, the tuning range of the profiles obviously becomes narrower with the laser field intensity increasing and a cross section of 1.25 × 10(-13)cm(2) at a laser intensity of 8.29 × 10(9)W/cm(2) is obtained. Our results indicate that dipole-quadrupole LICET process can be the effective way to transfer energy selectively from a storage state of arbitrary parity to a target state of arbitrary parity.