Chinese Optics Letters, Vol. 18, Issue 7, 070201 (2020)
Laser stabilizing to ytterbium clock transition with Rabi and Ramsey spectroscopy
Yuxin Sun, Yuan Yao*, Yaqin Hao, Hongfu Yu, Yanyi Jiang**, and Longsheng Ma
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
A cavity-stabilized 578 nm laser is used to probe the clock transition of ytterbium atoms trapped in optical lattice sites. We obtain a Fourier-limited 4.2-Hz-linewidth Rabi spectrum and a Ramsey spectrum with fringe linewidth of 3.3 Hz. Based on one of the spectra, the 578 nm laser light is frequency-stabilized to the center of the transition to achieve a closed-loop operation of an optical clock. Based on interleaved measurement, the frequency instability of a single optical clock is demonstrated to be 5.4 × 10?16/√τ.
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