Rubidium-beam microwave clock pumped by distributed feedback diode lasers |
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Affiliation: | 1. Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China;2. School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China |
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Abstract: | A rubidium-beam microwave clock, optically pumped by a distributed feedback diode laser, is experimentally investigated. The clock is composed of a physical package, optical systems, and electric servo loops. The physical package realizes the microwave interrogation of a rubidium-atomic beam. The optical systems, equipped with two 780-nm distributed feedback laser diodes, yield light for pumping and detecting. The servo loops control the frequency of a local oscillator with respect to the microwave spectrum. With the experimental systems, the microwave spectrum, which has an amplitude of 4 nA and a line width of 700 Hz, is obtained. Preliminary tests show that the clock short-term frequency stability is 7×10-11 at 1 s, and 3×10-12 at 1000 s. These experimental results demonstrate the feasibility of the scheme for a manufactured clock. |
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Keywords: | quantum frequency standard atomic clock atomic beam distributed feedback |
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