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Micromachines 2018, 9(8), 405; https://doi.org/10.3390/mi9080405

Alkali Vapor MEMS Cells Technology toward High-Vacuum Self-Pumping MEMS Cell for Atomic Spectroscopy

Wroclaw University of Science and Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego Str. 11/17, 50-372 Wroclaw, Poland
Received: 24 July 2018 / Revised: 7 August 2018 / Accepted: 12 August 2018 / Published: 16 August 2018
(This article belongs to the Special Issue Glassy Materials Based Microdevices)
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Abstract

The high-vacuum self-pumping MEMS cell for atomic spectroscopy presented here is the result of the technological achievements of the author and the research group in which he works. A high-temperature anodic bonding process in vacuum or buffer gas atmosphere and the influence of the process on the inner gas composition inside a MEMS structure were studied. A laser-induced alkali vapor introduction method from solid-state pill-like dispenser is presented as well. The technologies mentioned above are groundbreaking achievements that have allowed the building of the first European miniature atomic clock, and they are the basis for other solutions, including high-vacuum optical MEMS. Following description of the key technologies, high-vacuum self-pumping MEMS cell construction and preliminary measurement results are reported. This unique solution makes it possible to achieve a 10−6 Torr vacuum level inside the cell in the presence of saturated rubidium vapor, paving the way to building a new class of optical reference cells for atomic spectroscopy. Because the level of vacuum is high enough, experiments with cold atoms are potentially feasible. View Full-Text
Keywords: alkali cells; MEMS vapor cells; optical cells; atomic spectroscopy; microtechnology; microfabrication; MEMS alkali cells; MEMS vapor cells; optical cells; atomic spectroscopy; microtechnology; microfabrication; MEMS
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Knapkiewicz, P. Alkali Vapor MEMS Cells Technology toward High-Vacuum Self-Pumping MEMS Cell for Atomic Spectroscopy. Micromachines 2018, 9, 405.

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