162 citations · 412 across the 8 of their papers we have counts for
8 papers
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…
Ultra-broadband dual-comb spectroscopy across 1.0-1.9 μm
Sho Okubo, Kana Iwakuni, Hajime Inaba +4
We have carried out dual-comb spectroscopy and observed in a simultaneous acquisition a 140-THz-wide spectrum from 1.0 to 1.9 μm using two fiber-based frequency combs phase-locked…
A compact iodine-laser operating at 531 nm with stability at the 10 level and using a coin-sized laser module
Takumi Kobayashi, Daisuke Akamatsu, Kazumoto Hosaka +6
We demonstrate a compact iodine-stabilized laser operating at 531 nm using a coin-sized light source consisting of a 1062-nm distributed-feedback diode laser and a frequency-doubli…
Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks
Daisuke Akamatsu, Masami Yasuda, Hajime Inaba +4
The frequency ratio of the 1S0(F=1/2)-3P0(F=1/2) clock transition in 171Yb and the 1S0(F=9/2)-3P0(F=9/2) clock transition in 87Sr is measured by an optical-optical direct frequency…
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…
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…
Doppler-free spectroscopy of molecular iodine using a frequency-stable light source at 578 nm
Feng-Lei Hong, Hajime Inaba, Kazumoto Hosaka +2
A stable light source obtained using sum-frequency generation (SFG) is developed for high-resolution spectroscopy at 578 nm. Hyperfine transitions of molecular iodine are observed…