title: Influence of laser sources with different spectral properties on the performance of vapor cell atomic clocks based on lin||lin CPT.
abstract: We evaluate the influence of 2 types of laser sources with different spectral profiles on the performance of vapor cell atomic clocks based on lin||lin coherent population trapping (CPT) resonances. We show that a short-term stability of 1-2 x 10(-11) tau(-1/2) may be reached in a compact system using a modulated vertical cavity surface-emitting laser. Here the stability is limited by the detection noise level and can be improved up to a factor of 4 by increasing the lock-in detection frequency to several tens of kilohertz, which is not possible in standard double resonance atomic clocks. We compare these results with CPT prepared under the same experimental conditions, using 2 phase-locked extended cavity diode lasers, with which we predict a challenging short-term stability of 1-3 x 10(-13) tau(-1/2), comparable to the state-of-the-art laser-pumped Rb-clocks.
authors.affiliation: Laboratoire Temps-Fréquence, University of Neuchâtel, Neuchâtel, Switzerland.
authors.forename: Evelina
authors.initials: E
authors.lastname: Breschi
authors.forename: George
authors.initials: G
authors.lastname: Kazakov
authors.forename: Roland
authors.initials: R
authors.lastname: Lammegger
authors.forename: Boris
authors.initials: B
authors.lastname: Matisov
authors.forename: Laurentius
authors.initials: L
authors.lastname: Windholz
authors.forename: Gaetano
authors.initials: G
authors.lastname: Mileti