Abstract
A double-layer interferometer containing a sodium atomic vapour and irradiated by white light produces in the focal plane of a concave diffraction-grating spectrograph a set of concentric elliptic rings of equal chromatic order (RECO) that are crossed by the absorption D-line of Na atoms. The RECOs are strongly distorted in the close vicinity of the spectral components of the D-line. A comparison of the perturbed and the unperturbed RECOs yields a dispersion curve that is fitted to the Sellmeier function to find the level population whose dependence on the vapour temperature and/or pressure is found to exhibit an exponential growth.
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