Université de Neuchâtel

Light effects in the atomic-motion-induced Ramsey narrowing of dark resonances in wall-coated cells

Breschi, Evelina ; Kazakov, G. ; Schori, Christian ; Di Domenico, Gianni ; Mileti, Gaetano ; Litvinov, A. ; Matisov, B.

In: Physical Review A, 2010, vol. 82, no. 063810, p. 1-7

We report on light shift and broadening in the atomic-motion-induced Ramsey narrowing of dark resonances prepared in alkali-metal vapors contained in wall-coated cells without buffer gas. The atomic-motion-induced Ramsey narrowing is due to the free motion of the polarized atomic spins in and out of the optical interaction region before spin relaxation. As a consequence of this effect, we observe...

Université de Neuchâtel

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...

Université de Neuchâtel

Quantitative study of the destructive quantum-interference effect on coherent population trapping

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

In: Physical Review A, 2009, vol. 79, no. 6, p. 063837-1

We investigate experimentally and theoretically the coherent population trapping (CPT) effect occurring in 87Rb D1 line due to the interaction with linearly polarized laser light (lin∥lin CPT). In this configuration, the coherence is strongly influenced by the structure of the excited state; consequently, the quantum interference between dark states is an essential feature...