Spectroscopy in a micro-fabricated Rb cell with anti-relaxation wall-coating

We report on the realization and spectroscopic evaluation of a micro-fabricated Rb vapor cell equipped with an anti-relaxation OTS wall coating. By combining different spectroscopic results, we can exclude a hypothetical buffer-gas contamination of the cell as cause of the narrow double-resonance (DR) signals observed. We thus conclude that the narrow DR signal linewidth is due to the anti-relaxation wall-coating present in the cell. This realization presents interests in view of applications in miniaturized atomic devices such as atomic clocks, magnetometers, and others.