4 papers
Prevention of Yb adsorption by paraffin coating
Kanta Asakawa, Taichi Kobayashi, Masami Yasuda +2
Ytterbium (Yb) is used in cold-atom systems, including magneto-optical traps and optical lattice clocks. However, the long-term operation of such systems may be associated with sub…
Improved absolute frequency measurement of Yb at NMIJ with uncertainty below
Takumi Kobayashi, Akiko Nishiyama, Kazumoto Hosaka +6
We report improved absolute frequency measurement of the SP transition of Yb at National Metrology Institute of Japan (NMIJ) by comparing the $^{171}…
Isotope-shift analysis with the transition in ytterbium
Akio Kawasaki, Takumi Kobayashi, Akiko Nishiyama +2
Measurements of isotope shifts have recently been attracting considerable attention due to their potentials in searching for new forces. We report on the isotope shifts of the $4f^…
Generation of a precise time scale assisted by a near-continuously operating optical lattice clock
Takumi Kobayashi, Daisuke Akamatsu, Kazumoto Hosaka +8
We report on a reduced time variation of a time scale with respect to Coordinated Universal Time (UTC) by steering a hydrogen-maser-based time scale with a near-continuously operat…