Transmission sub-Doppler spectroscopy with confined atomic vapor film between two dielectric walls is theoretically studied. Because of atoms flying from wall to wall, where they get de-excited, the atom-field interaction time is anisotropic so that the contribution of slow atoms is enhanced, a sub-Doppler transmission spectroscopy (Dicke narrowing effect) can be obtained when the thickness of the film is much small or comparable with the wavelength even at small angle oblique incidence. It is feasible to get a sub-Doppler structure in a new region (L < ?/4) in experiments.
© 2005 Chinese Optics Letters
Yuanyuan Li, Yanpeng Zhang, and Chenli Gan, "Ultrathin atomic vapor film transmission spectroscopy: analysis of Dicke narrowing structure," Chin. Opt. Lett. 3, 672-675 (2005)