162 citations · 384 across the 12 of their papers we have counts for
12 papers
Broadband and flat-baseline dual-comb cavity mode dispersion spectroscopy using fiber-based frequency combs
Sho Okubo, Ken Kashiwagi, Koji Hashiguchi +1
We demonstrate broadband dual-comb cavity mode dispersion spectroscopy using mode-locked erbium-fiber frequency combs and a length-tunable optical cavity. The flat baseline and low…
Rotational energy levels in the ground vibrational state of methane with kHz-level accuracy from comb-referenced double-resonance and Lamb-dip spectroscopies
Vinicius Silva de Oliveira, Isak Silander, Hiroyuki Sasada +4
Methane is a key spherical-top molecule, yet restrictive selection rules for one-photon transitions have prevented determination of its ground state (GS) energies with state-of-the…
Optical sound pressure measurement using Fabry-Pérot cavity for primary acoustic standards
Koto Hirano, Wataru Kokuyama, Hajime Inaba +5
Optical sound pressure measurement is a promising technology to establish primary acoustic standards without reliance on specific types of microphones. We developed a precision opt…
Measurement of transition frequencies and hyperfine constants of molecular iodine at 520.2 nm
Akiko Nishiyama, Sho Okubo, Takumi Kobayashi +2
We measured the transition frequencies of the hyperfine components in the four lines (P(34) 39-0, R(36) 39-0, P(33) 39-0, and R(35) 39-0) of the B-X transitions of molecular iodine…
Erbium-doped-fiber-based broad visible range frequency comb with a 30 GHz mode spacing for astronomical applications
Keisuke Nakamura, Ken Kashiwagi, Sho Okubo +1
Optical frequency combs have the potential to improve the precision of the radial velocity measurement of celestial bodies, leading to breakthroughs in such fields as exoplanet exp…
Ultra-precise determination of thicknesses and refractive indices of optically thick dispersive materials by dual-comb spectroscopy
Kana A. Sumihara, Sho Okubo, Makoto Okano +2
Precise measurements of the geometrical thickness of a sample and its refractive index are important for materials science, engineering, and medical diagnosis. Among the possible n…