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

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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Submitted on : Tuesday, September 25, 2012 - 8:45:05 AM
Last modification on : Wednesday, November 28, 2018 - 2:48:22 PM

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D. Miletic, C. Affolderbach, M. Hasegawa, R. Boudot, C. Gorecki, et al.. AC Stark-shift in CPT-based Cs miniature atomic clocks. Applied Physics B - Laser and Optics, Springer Verlag, 2012, 108 (108), pp.469-702. ⟨10.1007/s00340-012-5121-7⟩. ⟨hal-00734965⟩



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