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Physical Review Letters

Experimental Evidence for Compensation of Doppler Broadening by Light Shifts

Serge Reynaud, M. Himbert, J. Dupont-Roc, H. Henry Stroke, Claude N. Cohen-Tannoudji

Published Mar 19, 1979• 32 citations
Publisher

Abstract

Velocity-dependent light shifts may be used to suppress the Doppler broadening of an atomic spectral line observed along a given direction. We present emission spectra of $^{20}\mathrm{Ne}$ demonstrating the existence of such an effect for an appreciable portion of the atoms. Various possible applications taking advantage of the high anisotropy of this effect are suggested.

DOI
10.1103/physrevlett.42.756

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Velocity-dependent light shifts may be used to suppress the Doppler broadening of an atomic spectral line observed along a given direction. We present emission spectra of 20Ne^{20}\mathrm{Ne}20Ne demonstrating the existence of such an effect for an appreciable portion of the atoms. Various possible applications taking advantage of the high anisotropy of this effect are suggested.
It is shown that the dispersion dependence of the rotation of the plane of polarisation of weak radiation passing through a three-level atomic medium may be free of Doppler broadening, on the account of a velocity-dependent Stark-shift which is created by saturating the wave on an adjacent transition. In the case of two-photon resonance the use of opposing light beams with different frequencies gives the possibility for an essential increase of the signal on account of the resonance gain on an intermediate transition, without additional Doppler broadening.