摘要
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/pτ.
基金
supported by the National Natural Science Foundation of China(Nos.11927810 and11822402)
the National Key R&D Program of China(No.2017YFA0304403)
