KEYWORDS: Chemical species, Clocks, Laser stabilization, Ytterbium, Optical lattice clocks, Fiber lasers, Frequency combs, Signal to noise ratio, Strontium, Spectroscopy
We report the current status of our ytterbium optical lattice clock at the NMIJ, AIST. After the first measurement of the
clock transition frequency and the estimation of the uncertainty, we have been improving our clock. For an increased
signal to noise ratio of the observed spectrum, we employed an atom number normalization scheme. We stabilized the
frequency of the lattice laser using a fiber-based optical frequency comb. We also stabilized the intensity of the lattice
laser.
We have developed a one-dimensional optical lattice clock with ultracold 171Yb atoms. The absolute frequency of the
1S0(F = 1/2) - 3P0(F = 1/2) clock transition in 171Yb is determined to be 518 295 836 590 864(28) Hz with respect to the
SI second. Details of the experimental setups and atom trapping results are also described.
The present status of the development of the Yb optical lattice clock at NMIJ/AIST and future prospects are presented.
Experimental equipments such as vacuum systems and laser sources are explained in detail.
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