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 l...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.展开更多
We present the frequency control of a 759 nm laser as a lattice laser for an ytterbium(Yb)optical clock.The frequency stability and accuracy are transferred from the Yb optical clock via an optical frequency comb.Alth...We present the frequency control of a 759 nm laser as a lattice laser for an ytterbium(Yb)optical clock.The frequency stability and accuracy are transferred from the Yb optical clock via an optical frequency comb.Although the comb is frequency-stabilized on a rubidium microwave clock,the frequency instability of the 759 nm laser is evaluated at the 10^(-15) level at 1 s averaging time.The frequency of the 759 nm laser is controlled with an uncertainty within 1 Hz by referencing to the Yb clock transition.Such a frequency-controlled 759 nm laser is suitable for Yb optical clocks as the lattice laser.The technique of laser frequency control can be applied to other lasers in optical clocks.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11927810 and11822402)the National Key R&D Program of China(No.2017YFA0304403)
文摘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(No.11927810)。
文摘We present the frequency control of a 759 nm laser as a lattice laser for an ytterbium(Yb)optical clock.The frequency stability and accuracy are transferred from the Yb optical clock via an optical frequency comb.Although the comb is frequency-stabilized on a rubidium microwave clock,the frequency instability of the 759 nm laser is evaluated at the 10^(-15) level at 1 s averaging time.The frequency of the 759 nm laser is controlled with an uncertainty within 1 Hz by referencing to the Yb clock transition.Such a frequency-controlled 759 nm laser is suitable for Yb optical clocks as the lattice laser.The technique of laser frequency control can be applied to other lasers in optical clocks.
