445 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- National Institute of Advanced Industrial Science and TechnologyJP58 papers
- The University of TokyoJP24 papers
- Centre National de la Recherche ScientifiqueFR21 papers
- Tokyo Institute of TechnologyJP21 papers
- National Astronomical Observatory of JapanJP18 papers
- The University of OsakaJP18 papers
- Hiroshima UniversityJP17 papers
- Beijing Normal UniversityCN16 papers
- Chinese Academy of SciencesCN16 papers
- Institute of Space and Astronautical ScienceJP16 papers
- Kyoto UniversityJP16 papers
- Massachusetts Institute of TechnologyUS16 papers
10 papers · 1 filter
Search for ultralight dark matter from long-term frequency comparisons of optical and microwave atomic clocks
Takumi Kobayashi, Akifumi Takamizawa, Daisuke Akamatsu +8
We search for ultralight scalar dark matter candidates that induce oscillations of the fine structure constant, the electron and quark masses, and the quantum chromodynamics energy…
Improved Frequency Ratio Measurement with 87Sr and 171Yb Optical Lattice Clocks at NMIJ
Yusuke Hisai, Daisuke Akamatsu, Takumi Kobayashi +4
We report improved frequency ratio measurement with Sr and Yb optical lattice clocks at the National Metrology Institute of Japan (NMIJ). The Sr optical latti…
Geometrically asymmetric optical cavity for strong atom-photon coupling
Akio Kawasaki, Boris Braverman, Edwin Pedrozo-Peñafiel +11
Optical cavities are widely used to enhance the interaction between atoms and light. Typical designs using a geometrically symmetric structure in the near-concentric regime face a…
Dual-Mode Operation of an Optical Lattice Clock Using Strontium and Ytterbium Atoms
Daisuke Akamatsu, Takumi Kobayashi, Yusuke Hisai +4
We have developed an optical lattice clock that can operate in dual modes: a strontium (Sr) clock mode and an ytterbium (Yb) clock mode. Dual-mode operation of the Sr-Yb optical la…
A frequency-stabilized light source at 399 nm using an Yb hollow-cathode lamp
Takehiko Tanabe, Daisuke Akamatsu, Hajime Inaba +5
We demonstrate a diode laser system operating at 399 nm that is stabilized to the electric dipole transition in ytterbium (Yb) atoms in…
Absolute frequency measurements and hyperfine structures of the molecular iodine transitions at 578 nm
Takumi Kobayashi, Daisuke Akamatsu, Kazumoto Hosaka +6
We report absolute frequency measurements of 81 hyperfine components of the rovibrational transitions of molecular iodine at 578 nm using the second harmonic generation of an 1156-…
Improved frequency measurement of the - clock transition in Sr using the Cs fountain clock at NMIJ as a transfer oscillator
Takehiko Tanabe, Daisuke Akamatsu, Takumi Kobayashi +10
We performed an absolute frequency measurement of the - transition in Sr with a fractional uncertainty of , which is less than one thi…
Spectroscopy and frequency measurement of the Sr clock transition by laser linewidth transfer using an optical frequency comb
Daisuke Akamatsu, Hajime Inaba, Kazumoto Hosaka +5
We perform spectroscopic observations of the 698-nm clock transition in Sr confined in an optical lattice using a laser linewidth transfer technique. A narrow-linewidth lase…
An accurate determination of the Avogadro constant by counting the atoms in a 28Si crystal
B. Andreas, Y. Azuma, G. Bartl +23
The Avogadro constant links the atomic and the macroscopic properties of matter. Since the molar Planck constant is well known via the measurement of the Rydberg constant, it is al…
Fiber-comb-stabilized light source at 556 nm for magneto-optical trapping of ytterbium
Masami Yasuda, Takuya Kohno, Hajime Inaba +4
A frequency-stabilized light source emitting at 556 nm is realized by frequency-doubling a 1112-nm laser, which is phase-locked to a fiber-based optical frequency comb. The 1112-nm…