AC Stark-shift in CPT-based Cs miniature atomic clocks |
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Authors: | D. Miletic C. Affolderbach M. Hasegawa R. Boudot C. Gorecki G. Mileti |
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Affiliation: | 1. Laboratoire Temps-Fr??quence (LTF), Institut de Physique, Universit?? de Neuchatel, Avenue de Bellevaux 51, 2000, Neuchatel, Switzerland 2. FEMTO-ST, CNRS et Universit?? de Franche-Comt??, 32 avenue de l??observatoire, 25044, Besan?on cedax, France
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Abstract: | 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 894.6?nm. 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. |
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