title: Double-resonance polarization spectroscopy using modulation sidebands.
abstract: A novel technique for ultrahigh-resolution laser spectroscopy is described. Coherence between atomic substates created by an amplitude-modulated light beam is monitored in transmission of a weak probe beam by polarizationselective optical heterodyne detection. As a demonstration, the technique is applied to Zeeman sublevels of the sodium ground state. The width (FWHM) of the observed resonances corresponds to 60 kHz.
authors.forename: J
authors.initials: J
authors.lastname: Mlynek
authors.forename: K H
authors.initials: KH
authors.lastname: Drake
authors.forename: G
authors.initials: G
authors.lastname: Kersten
authors.forename: D
authors.initials: D
authors.lastname: Frölich
authors.forename: W
authors.initials: W
authors.lastname: Lange