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We have being developing optical frequency combs, especially fiber-based frequency combs with narrow linewidth, for laser frequency measurement and control. We are also working on Yb and Sr optical lattice clocks for precision frequency metrology.
We demonstrate an improved absolute frequency measurement of the 1S0-3P0 clock transition at 578 nm in 171Yb atoms in a one-dimensional optical lattice. The absolute frequency is determined as 518 295 836 590 863.1(2.0) Hz relative to the SI second.
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. The signal-to-noise ratio of the spectrum was increased by 10 times by an atom number normalization scheme.
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 combs that are used not only to measure the absolute frequency of the optical lattice clocks but also to servo...
We have being developing optical frequency combs, especially fiber-based frequency combs, for laser frequency measurement and laser frequency control. We are also working on Yb and Sr optical lattice clocks for precision frequency metrology.
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 been developing a new clock laser system for Yb and Sr optical lattice clocks. The system is based on an infrared laser with a narrow linewidth, and a fiber-based frequency comb transferring the linewidth to required plural wavelengths. We demonstrate that fiber-based frequency combs with a multi-branch configuration can transfer laser linewidth to another wavelength at the millihertz level...
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.
A development plan and the present status of the optical lattice clock in NMIJ, especially the details of the vacuum system and the laser sources, are described
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