title: Coherent population trapping spectra in presence of ac magnetic fields.
abstract: Experimental and theoretical investigations are reported on the effects induced by an alternating magnetic field on coherent population trapping resonances. We show that the ac magnetic field produces sidebands of these resonances in such a way that the spectrum observed is similar to those observed via the FM spectroscopic technique. Because of the very narrow linewidth of the resonances, sidebands are resolved even for ac field frequencies as low as a fraction of a kHz. The theoretical model developed, which takes into account a very simple atomic structure, fits the experimental data quite well.
authors.affiliation: Dipartimento di Fisica, Università di Siena, Via Roma 56, 53100 Siena, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Bevilacqua
authors.forename: V
authors.initials: V
authors.lastname: Biancalana
authors.forename: E
authors.initials: E
authors.lastname: Breschi
authors.forename: Y
authors.initials: Y
authors.lastname: Dancheva
authors.forename: L
authors.initials: L
authors.lastname: Moi
authors.forename: Ch
authors.initials: Ch
authors.lastname: Andreeva
authors.forename: S
authors.initials: S
authors.lastname: Cartaleva
authors.forename: T
authors.initials: T
authors.lastname: Karaulanov