Influence of Laser Sources With Different Spectral Properties on the Performance of Vapor Cell Atomic Clocks Based on lin||lin CPT

IEEE Trans Ultrason Ferroelectr Freq Control. 2009 May;56(5):926-30. doi: 10.1109/TUFFC.2009.1125.

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.

Publication types

  • Research Support, Non-U.S. Gov't