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arXiv · 1701.05696

Two-step pulse observation to improve resonance contrast for coherent population trapping atomic clock

Yuichiro Yano·Shigeyoshi Goka·Masatoshi Kajita
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Abstract

We study resonance contrast by a two-step pulse observation method to enhance the frequency stability of coherent population trapping (CPT) atomic clocks. The proposed method is a two-step Raman--Ramsey scheme with low intensity during resonance observation and high intensity after the observation. This method reduces the frequency variation in the light intensity and maintains a high signal-to-noise ratio. The resonance characteristics were calculated by density matrix analysis of a $Λ$-type three-level system that was modeled on the $^{133}$Cs D1 line, and the characteristics were also measured using a vertical-cavity surface-emitting laser and a Cs vapor cell.

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Yuichiro Yano, Shigeyoshi Goka, Masatoshi Kajita. 2017-01-20. Two-step pulse observation to improve resonance contrast for coherent population trapping atomic clock. https://doi.org/10.1007/s00340-017-6650-x

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