4 May 2015 Portable atomic frequency standard based on coherent population trapping
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Proceedings Volume 9543, Third International Symposium on Laser Interaction with Matter; 95431R (2015) https://doi.org/10.1117/12.2180549
Event: Third International Symposium on Laser Interaction with Matter, 2014, Jiangsu, China
Abstract
In this work, a portable atomic frequency standard based on coherent population trapping is designed and demonstrated. To achieve a portable prototype, in the system, a single transverse mode 795nm VCSEL modulated by a 3.4GHz RF source is used as a pump laser which generates coherent light fields. The pump beams pass through a vapor cell containing atom gas and buffer gas. This vapor cell is surrounded by a magnetic shield and placed inside a solenoid which applies a longitudinal magnetic field to lift the Zeeman energy levels’ degeneracy and to separate the resonance signal, which has no first-order magnetic field dependence, from the field-dependent resonances. The electrical control system comprises two control loops. The first one locks the laser wavelength to the minimum of the absorption spectrum; the second one locks the modulation frequency and output standard frequency. Furthermore, we designed the micro physical package and realized the locking of a coherent population trapping atomic frequency standard portable prototype successfully. The short-term frequency stability of the whole system is measured to be 6×10−11 for averaging times of 1s, and reaches 5×10−12 at an averaging time of 1000s.
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Fan Shi, Fan Shi, Renfu Yang, Renfu Yang, Feng Nian, Feng Nian, Zhenwei Zhang, Zhenwei Zhang, Yongshun Cui, Yongshun Cui, Huan Zhao, Huan Zhao, Nuanrang Wang, Nuanrang Wang, Keming Feng, Keming Feng, } "Portable atomic frequency standard based on coherent population trapping", Proc. SPIE 9543, Third International Symposium on Laser Interaction with Matter, 95431R (4 May 2015); doi: 10.1117/12.2180549; https://doi.org/10.1117/12.2180549
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