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AC Stark-shift in CPT-based Cs miniature atomic clocks

Miletic, D. ; Affolderbach, C. ; Hasegawa, M. ; Boudot, R. ; Gorecki, C. ; Mileti, G.

In: Applied Physics B, 2012, vol. 109, no. 1, p. 89-97

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    Titre
    • AC Stark-shift in CPT-based Cs miniature atomic clocks
    Auteur
    • Miletic, D.. Laboratoire Temps-Fréquence (LTF), Institut de Physique, Université de Neuchâtel, Avenue de Bellevaux 51, 2000, Neuchâtel, Switzerland
    • Affolderbach, C.. Laboratoire Temps-Fréquence (LTF), Institut de Physique, Université de Neuchâtel, Avenue de Bellevaux 51, 2000, Neuchâtel, Switzerland
    • Hasegawa, M.. FEMTO-ST, CNRS et Université de Franche-Comté, 32 avenue de l'observatoire, 25044, Besançon cedax, France
    • Boudot, R.. FEMTO-ST, CNRS et Université de Franche-Comté, 32 avenue de l'observatoire, 25044, Besançon cedax, France
    • Gorecki, C.. FEMTO-ST, CNRS et Université de Franche-Comté, 32 avenue de l'observatoire, 25044, Besançon cedax, France
    • Mileti, G.. Laboratoire Temps-Fréquence (LTF), Institut de Physique, Université de Neuchâtel, Avenue de Bellevaux 51, 2000, Neuchâtel, Switzerland
    Type de document
    • Postprint
    Classification
    • Physique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:319969
    Summary
    We report on studies on the light-shift in caesium miniature atomic clocks based on coherent population trapping (CPT) using a micro-fabricated buffer-gas cell (MEMS cell). The CPT signal is observed on the Cs D1-line by coupling the two hyperfine ground-state Zeeman sublevels involved in the clock transition to a common excited state, using two coherent electromagnetic fields. These light fields are created with a distributed feedback laser and an electro-optical modulator. We study the light-shift phenomena at different cell temperatures and laser wavelengths around 894.6nm. By adjusting the cell temperature, conditions are identified where a miniature CPT atomic clock can be operated with simultaneously low temperature coefficient and suppressed light-shift. The impact of the light-shift on the clock frequency stability is evaluated. These results are relevant for improving the long-term frequency stability of CPT-based Cs vapour-cell clocks