NONSTATIONARY 2-PHOTON DOPPLER-FREE COHERENT SPECTROSCOPY IN AN ATOMIC GAS IN THE PRESENCE OF DEPOLARIZING COLLISIONS

Non-stationary two-photon absorption coherent spectroscopy free of Dop pler broadening in an atomic gas has been considered in detail. Correc t account has been taken of the level degeneracy and depolarizing coll isions. This two-photon Doppler-free spectroscopy has been developed f or determining the relaxation rates of the atomic multipole moments in gas. A criterion to test the adopted model of the depolarizing collis ions has been developed. A possible method for the identification of t he atomic transitions in the angular momentum has been formulated. A t echnique of precisely determining the separation between the energy le vels of the two-photon transition has been proposed. The conditions un der which the Stokes wave is conjugated with respect to the probe puls e in amplitude, phase and polarization have been determined for the at omic gas in the presence of depolarizing collisions.