Faculté des sciences

Influence of laser sources with different spectral properties on the performance of vapor cell atomic clocks based on lin‖lin CPT

Breschi, Evelina ; Kazakov, G. ; Lammegger, R. ; Matisov, B. ; Windholz. L. ; Mileti, Gaetano

In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2009, vol. 56, no. 5, p. 926-930

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 • 10-11Τ-1/2 may be reached in a compact system using a modulated vertical cavity surface-emitting laser. Here the stability is... Plus

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    Summary
    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 • 10-11Τ-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 • 10-13Τ-1/2, comparable to the state-of-the-art laser-pumped Rb-clocks.