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Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock
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作者 Chang Zhan Zhu Ma +4 位作者 Jiatao Wu Maojie Li Chengyin Han Bo Lu Chaohong Lee 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第8期7-12,共6页
Accurate control of magnetic fields is crucial for cold-atom experiments,often necessitating custom-designed control systems due to limitations in commercially available power supplies.Here,we demonstrate precise and ... Accurate control of magnetic fields is crucial for cold-atom experiments,often necessitating custom-designed control systems due to limitations in commercially available power supplies.Here,we demonstrate precise and flexible control of a static magnetic field by employing a field-programmable gate array and a feedback loop.This setup enables us to maintain exceptionally stable current with a fractional stability of 1 ppm within 30 s.The error signal of the feedback loop exhibited a noise level of 10^(-5)A·Hz^(-1/2)for control bandwidths below 10 k Hz.Utilizing this precise magnetic field control system,we investigate the second-order Zeeman shift in the context of cold-atom coherent population-trapping (CPT)clocks.Our analysis reveals the second-order Zeeman coefficient to be 574.21 Hz/G^(2),with an uncertainty of 1.36 Hz/G^(2).Consequently,the magnetic field stabilization system we developed allows us to achieve a second-order Zeeman shift below10^(-14),surpassing the long-term stability of current cold-atom CPT clocks. 展开更多
关键词 cold-atom coherent population-trapping clock Zeeman coefficient magnetic field stabilization system
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Stable ^(85)Rb micro vapour cells:fabrication based on anodic bonding and application in chip-scale atomic clocks 被引量:3
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作者 苏娟 邓科 +4 位作者 郭等柱 汪中 陈兢 张耿民 陈徐宗 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第11期243-250,共8页
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... 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 mm^3 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. 展开更多
关键词 ^85Rb Micro vapour cell anodic bonding coherent population trapping chip-scale atomic clock frequency stability
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