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Micro-fabrication and hermeticity measurement of alkali-atom vapor cells based on anodic bonding

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Abstract

A vapor cell provides a well-controlled and stable inner atmosphere for atomic sensors, such as atomic gyroscopes, atomic magnetometers, and atomic clocks, and its hermeticity affects the stability and aging of atomic sensors. We present the micro-fabrication of a micro-electromechanical system wafer-level hermit vapor cell based on deep reactive ion etching and vacuum anodic-bonding technology. The anodic-bonding process with the voltage increasing in steps of 200 V had a critical influence on vapor cell hermeticity. Further, the silicon–glass bonding surface was experimentally investigated by a scanning electron microscope, which illustrated that there were no visual cracks and defects in the bonding surface. The leak rate was measured using a helium leak detector. The result shows that the vapor cells with different optical cavity lengths comply with the MIL-STD-883E standard (5 × 10?8 mbar·L/s). Moreover, D2 absorption spectroscopy was characterized via optical absorption. The bonding strength was determined to be 13 MPa, which further verified the quality of the vapor cells.

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DOI:10.3788/COL201917.100201

所属栏目:Atomic and molecular physics

基金项目:This work was supported by the National Key Research and Development Program of China (No. 2017YFB0503200), the National Natural Science Foundation of China (Nos. 61675185 and 61875250), and the Natural Science Foundation of Shanxi Province (No. 201701D121065).

收稿日期:2019-05-17

录用日期:2019-07-26

网络出版日期:2019-08-29

作者单位    点击查看

Lu Zhang:Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
Wendong Zhang:Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
Shougang Zhang:Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
Shubin Yan:Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China

联系人作者:Shubin Yan(shubin_yan@nuc.edu.cn)

备注:This work was supported by the National Key Research and Development Program of China (No. 2017YFB0503200), the National Natural Science Foundation of China (Nos. 61675185 and 61875250), and the Natural Science Foundation of Shanxi Province (No. 201701D121065).

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引用该论文

Lu Zhang, Wendong Zhang, Shougang Zhang, Shubin Yan, "Micro-fabrication and hermeticity measurement of alkali-atom vapor cells based on anodic bonding," Chinese Optics Letters 17(10), 100201 (2019)

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