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Raman Atomic Fountain Clock

Qu Qiuzhi Zhou Zichao Wan Jinyin Liu Liang(Key Laboratory for Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai,201800,China)  
An atomic fountain clock based on Raman laser field instead of microwave cavity is proposed.This scheme combines the separate Raman fields technology and the cold atomic fountain technology,cancels the microwave fountain clock in the vacuum cavity and meanwhile keeps a high accuracy.The interaction process of the cold atomic fountain and the Raman laser field is studied with the semiclassical theory and the Ramsey fringes are acquired.The Raman fountain clock is compared with the atomic beam clock of hot cesium atoms,and it is found that the accuracy of Raman fountain clock higher and its capacity and power consumption are much smaller.Compared with the microwave fountain clock,the Raman fountain clock must consider the influence of photon recoil.With the photon recoil,it is proposed to measure the fine structure constant by using two Raman fountain clocks.
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