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Laser frequency stabilization and atom manipulation are important techniques for optical frequency metrology. We report on the development of an ytterbium (171Yb) and a strontium (87Sr) optical lattice clock at the National Metrology Institute of Japan (NMIJ). The result of absolute frequency measurement of the 171Yb lattice clock is shown. We also report on narrow-linewidth fiber-based frequency...
Experimental efforts to reduce the uncertainty of the ytterbium (171Yb) optical lattice clock at NMIJ, AIST are shown. Especially, atom number normalization scheme is presented.
The present status of the development of an 87Sr optical lattice clock at NMIJ is reported. We also describe our frequency doubling system with a periodically poled lithium niobate waveguide for the first stage cooling laser at 461 nm.
We have developed a one-dimensional optical lattice clock using a fermionic isotope of ytterbium (171Yb). The absolute frequency of the 1S0 - 3P0 clock transition in 171Yb is determined with respect to the SI second.
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