Coherent population trapping in an optically dense medium

S. Balushev, Norbert Leinfellner, Eugeny Korsunsky +1 more

К. А. Баранцев, Г. В. Волошин, A. N. Litvinov +1 more

In this paper we investigate the effects observed in optical dense medium when detecting the coherent population trapping resonance by the Ramsey method. The cloud of cold atoms interacts with two laser pulses one of which excites the coherent population trapping resonance and the second detects it. The signal of radiation passed through the medium and signal of fluorescence were analyzed. Shifts of the side peaks of the Ramsey fringes are observed with increasing optical density of the medium.

Yu. A. Vdovin, А. Е. Efimov

Г. В. Волошин, К. А. Баранцев, Е. Н. Попов +1 more

Abstract The effect of the hyperfine structure of an excited level on the shape of the coherent population trapping (CPT) resonance under Ramsey interrogation is investigated in media with different optical thicknesses. The shape of the CPT resonance is constructed for optically thin and dense media, and the results are compared. The dependence of the light shift on the optical density of a medium is analyzed. The parameters of the field phases are determined for which the light shift remains constant under fluctuations of the optical thickness of the medium.

Wolfgang Maichen, Rainer Gaggl, Eugeny Korsunsky +1 more