Stable 85Rb micro vapour cells: fabrication based on anodic bonding and application in chip-scale atomic clocks

doi:10.1088/1674-1056/19/11/110701

Abstract We describe the microfabrication of ⁸⁵Rb vapour cells using a glass-silicon anodic bonding technique and in situ chemical reaction between rubidium chloride and barium azide to produce Rb. Under controlled conditions, the pure metallic Rb drops and buffer gases were obtained in the cells with a few mm³ internal volumes during the cell sealing process. At an ambient temperature of 90 ℃ the optical absorption resonance of ⁸⁵Rb D1 transition with proper broadening and the corresponding coherent population trapping (CPT) resonance, with a signal contrast of 1.5% and linewidth of about 1.7 kHz, have been detected. The sealing quality and the stability of the cells have also been demonstrated experimentally by using the helium leaking detection and the after-9-month optoelectronics measurement which shows a similar CPT signal as its original status. In addition, the physics package of chip-scale atomic clock (CSAC) based on the cell was realized. The measured frequency stability of the physics package can reach to 2.1×10^-10 at one second when the cell was heated to 100 ℃ which proved that the cell has the quality to be used in portable and battery-operated devices.

Keywords: ⁸⁵Rb Micro vapour cell anodic bonding coherent population trapping chip-scale atomic clock frequency stability

Received: 10 May 2010
Revised: 21 June 2010
Accepted manuscript online:

PACS:	06.30.Ft	(Time and frequency)
	07.10.Cm	(Micromechanical devices and systems)

Fund: Project supported by National 863/973 Plans Projects (Grant Nos. 2006AA04Z361, 2006CB932402) and NSFC (Grant No. 60971002).

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Su Juan(苏娟), Deng Ke(邓科), Guo Deng-Zhu(郭等柱), Wang Zhong(汪中), Chen Jing(陈兢), Zhang Geng-Min(张耿民), and Chen Xu-Zong(陈徐宗) Stable ⁸⁵Rb micro vapour cells: fabrication based on anodic bonding and application in chip-scale atomic clocks 2010 Chin. Phys. B 19 110701

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Stable 85Rb micro vapour cells: fabrication based on anodic bonding and application in chip-scale atomic clocks

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Stable ⁸⁵Rb micro vapour cells: fabrication based on anodic bonding and application in chip-scale atomic clocks