Abstract

To overcome various problems in cesium beam resonators using polarized magnetic fields, researches on cesium beam resonators with optical pumping are being carried out. In these optically pumped cesium beam resonators, the frequency fluctuations of the laser diode (LD) used to excite the cesium beam affects the frequency stability of the resonator. This paper proposes a method in which the frequency fluctuations of the laser light are reduced to the noise induced on the control loop of the resonator. In this method, the absorption line of the cesium beam is used as the light standard frequency and the frequency fluctuations of the stabilized LD is determined. Further, such frequency-stabilized LD is used in an optically pumped cesium beam resonator and its short-term frequency stability is analyzed. As a result, it is shown that high-frequency stability syo(γ) < 10−13/τ is achievable while the cesium beam intensity and absorption linewidth remain the same as those of present small resonators.

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