Microfabricated Alkali Vapor Cell with Anti-Relaxation Wall Coating

Matthieu Pellaton, Christoph Affolderbach, R Straessle, Y Pétremand, D. Briand & N.F. Rooij

Résumé We present a microfabricated alkali vapor cell equipped with an anti-relaxation wall coating. The anti-relaxation coating used is octadecyltrichlorosilane and the cell was sealed by thin-film indium-bonding at a low temperature of 140 °C. The cell body is made of silicon and Pyrex and features a double-chamber design. Depolarizing properties due to liquid Rb droplets are avoided by confining the Rb droplets to one chamber only. Optical and microwave spectroscopy performed on this wall-coated cell are used to evaluate the cell's relaxation properties and a potential gas contamination. Double-resonance signals obtained from the cell show an intrinsic linewidth that is significantly lower than the linewidth that would be expected in case the cell had no wall coating but only contained a buffer-gas contamination on the level measured by optical spectroscopy. Combined with further experimental evidence this proves the presence of a working anti-relaxation wall coating in the cell. Such cells are of interest for applications in miniature atomic clocks, magnetometers, and other quantum sensors.
This work was supported by the Swiss National Science Foundation (Sinergia grant CRSI20-122693/1). M.P., C.A., and G.M. also acknowledge support from the European Space Agency (ESA) under the networking/partnering initiative (NPI) and the Swiss National Science Foundation Grant No. 200020_140681. The authors thank the CMI and the CSEM microsystems division staff and all the Sinergia project partners for their contributions and help.
Citation Pellaton, M., Affolderbach, C., Straessle, R., Pétremand, Y., Briand, D., & Rooij, N. (2014). Microfabricated Alkali Vapor Cell with Anti-Relaxation Wall Coating. Applied Physics Letters, 105, 1-2.
Type Article de périodique (Anglais)
Date de publication 28-7-2014
Nom du périodique Applied Physics Letters
Volume 105
Pages 1-2
URL https://doi.org/10.1063/1.4891248