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Progress report on the development of an European chip scale atomic clock at the FEMTO-ST Institute

V. Giordano, A. Douahi, Madoka Hasegawa, P. Dziuban, Ł. Nieradko, Jan Dziuban, Christophe Gorecki

Published May 1, 2008• 0 citations
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The convergence of atomic spectroscopy, MEMS cell technologies and integrated photonics has led to the deployment of high-precision chip-scale atomic devices [1]. In this talk, we will present in-progress studies at FEMTO-ST Institute, France, for the development of microcellbased microwave and optical atomic clocks, with enhanced stability performances. In the first part, we will talk about the demonstration of CPT-based microwave cell clocks with stability at 1 day in the low 10−12 range [2], made possible thanks to the combination of advanced Ramsey-based interrogation sequences [3] and cells built with low gas permeation windows [4-5]. In the second part, we will discuss the in-progress development of a microcell-based optical frequency reference based on the two-photon transition of Rb atom at 778 nm. An encouraging short-term stability of 3 × 10−13 at 1 s and 3 × 10−14 at 100 s has been recently achieved [6]. Future studies will be briefly discussed.

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•Sep 14, 2026•0 citations
The convergence of atomic spectroscopy, MEMS cell technologies and integrated photonics has led to the deployment of high-precision chip-scale atomic devices [1]. In this talk, we will present in-progress studies at FEMTO-ST Institute, France, for the development of microcellbased microwave and optical atomic clocks, with enhanced stability performances. In the first part, we will talk about the demonstration of CPT-based microwave cell clocks with stability at 1 day in the low 10−12 range [2], made possible thanks to the combination of advanced Ramsey-based interrogation sequences [3] and cells built with low gas permeation windows [4-5]. In the second part, we will discuss the in-progress development of a microcell-based optical frequency reference based on the two-photon transition of Rb atom at 778 nm. An encouraging short-term stability of 3 × 10−13 at 1 s and 3 × 10−14 at 100 s has been recently achieved [6]. Future studies will be briefly discussed.
We summarize activities performed at FEMTO-ST Institute and Centrale Lille/IEMN over the last years on the development of microfabricated vapor cells dedicated to atomic clocks, frequency references and sensors. Recent advances on the microcell technology are described. We have demonstrated CPT-based microwave clocks with stability in the low 10−12 range thanks to the implementation of advanced pulsed Ramsey-based interrogation sequences and cells built with low-permeation glass substrates and Al2O3 coatings. We have developed microcell optical frequency references, one based on the two-photon transition of Rb atom at 778 nm and one on saturated absorption of the 6S1/2-7P1/2 transition of Cs atom at 459 nm, with short-term stability levels in the low 10−13 range at 1 s and averaging down in the low 10−14 range after 100 s. Optically pumped magnetometers with sensitivity at the level of 100 fT/√Hz have also been demonstrated. In-progress studies, on both the cell technology and metrology aspects, are also discussed.