The integrated swiss miniature atomic clock

Haesler, Jacques; Balet, Laurent; Porchet, Jacques-André; Overstolz, T.; Pierer, J.; James, Rony Jose; Grossmann, Sylvain; Ruffieux, David; Lecomte, Steve

doi:10.1109/eftf-ifc.2013.6702125

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…The conventional method is using BaN 6 and RbCl to release the rubidium substance by chemical reaction at high temperature, but the compound is poisonous and a reverse reaction exists [ 38 ]. The improved method is the in-situ ultraviolet decomposition of RbN 3 , while the buffer gas pressure is difficult to be precisely controlled [ 39 , 40 , 41 , 42 ]. Another strategy is to use paraffin to fully cover rubidium in the glove box with MEMS molds and to transport the paraffin-rubidium package to the cell directly, regardless of atmosphere [ 43 ].…”

Section: Vapor Cell Fabricationmentioning

confidence: 99%

Microfabricated Vapor Cells with Reflective Sidewalls for Chip Scale Atomic Sensors

et al. 2018

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We investigate the architecture of microfabricated vapor cells with reflective sidewalls for applications in chip scale atomic sensors. The optical configuration in operation is suitable for both one-beam and two-beam (pump & probe) schemes. In the miniaturized vapor cells, the laser beam is reflected twice by the aluminum reflectors on the wet etched 54.7° sidewalls to prolong the optical length significantly, thus resulting in a return reflectance that is three times that of bare silicon sidewalls. To avoid limitations faced in the fabrication process, a simpler, more universal and less constrained fabrication process of microfabricated vapor cells for chip scale atomic sensors with uncompromised performance is implemented, which also decreases the fabrication costs and procedures. Characterization measurements show that with effective sidewall reflectors, mm3 level volume and feasible hermeticity, the elongated miniature vapor cells demonstrate a linear absorption contrast improvement by 10 times over the conventional micro-electro-mechanical system (MEMS) vapor cells at ~50 °C in the rubidium D1 absorption spectroscopy experiments. At the operating temperature of ~90 °C for chip scale atomic sensors, a 50% linear absorption contrast enhancement is obtained with the reflective cell architecture. This leads to a potential improvement in the clock stability and magnetometer sensitivity. Besides, the coherent population trapping spectroscopy is applied to characterize the microfabricated vacuum cells with 46.3 kHz linewidth in the through cell configuration, demonstrating the effectiveness in chip scale atomic sensors.

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