Microwave Pulse-Coherent Technique-Based Clock With a Novel Magnetron-Type Cavity

We report a high-performance pulsed optically pumped (POP) Rb clock based on a novel magnetron-type microwave cavity. The cavity has a volume of 30 mL, enabling a highly homogenous microwave field distribution. With the laser frequency tuning to the ground-state hyperfine level {F}= {2} of the {D...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2020-04, Vol.67 (4), p.873-878
Main Authors: Hao, Qiang, Xue, Wenxiang, Li, Wenbing, Xu, Feng, Wang, Xin, Guo, Wenge, Yun, Peter, Zhang, Shougang
Format: Article
Language:English
Subjects:
Atomic clock
Cavity resonators
Clocks
Frequency stability
Laser stability
Luminous intensity
magnetron-type cavity
Masers
Microwave oscillators
Noise intensity
Optical pumping
Relative intensity noise
Shot noise
signal contrast
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Summary:We report a high-performance pulsed optically pumped (POP) Rb clock based on a novel magnetron-type microwave cavity. The cavity has a volume of 30 mL, enabling a highly homogenous microwave field distribution. With the laser frequency tuning to the ground-state hyperfine level {F}= {2} of the {D}_{{2}} line, we observe a Ramsey fringe contrast of 52% in terms of optical absorption detection. The resultant shot noise limit is estimated to be {1.6} \,\times \, {10}^{-{14}}{\tau }^{-\text {1/2}} . The clock frequency stability is measured as {2.3}\,\times \, {10}^{-{13}}\tau ^{-\text {1/2}} (1-100 s), which is limited by the relative intensity noise of the light.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2019.2955574