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arXiv:1803.08746 · Physics Letters A

Study of EIT resonances in an anti-relaxation coated Rb vapor cell

Mangesh Bhattarai, Vineet Bharti, Vasant Natarajan A, Armen D. Sargsyan, David G. Sarkisyan

Published Oct 1, 2018• 28 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2018.09.036

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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.
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.