62 citations · 138 across the 5 of their papers we have counts for
5 papers
Frequency ratio of an In ion clock and a Sr optical lattice clock
Nozomi Ohtsubo, Ying Li, Nils Nemitz +4
We report on the first frequency ratio measurement of an In+ single ion clock and a Sr optical lattice clock. A hydrogen maser serves as a reference oscillator to me…
Frequency measurement of the clock transition of an indium ion sympathetically-cooled in a linear trap
Nozomi Ohtsubo, Ying Li, Kensuke Matsubara +2
We report frequency measurement of the clock transition in an 115In+ ion sympathetically-cooled with Ca+ ions in a linear rf trap. The Ca+ ions are used as a probe of the external…
A simplified 461-nm laser system using blue laser diodes and a hollow cathode lamp for laser cooling of Sr
Yosuke Shimada, Yuko Chida, Nozomi Ohtsubo +2
We develop a simplified light source at 461 nm for laser cooling of Sr without frequency-doubling crystals but with blue laser diodes. An anti-reflection coated blue laser diode in…
Buffer gas-assisted polarization spectroscopy of 6Li
Nozomi Ohtsubo, Takatoshi Aoki, Yoshio Torii
We report on the demonstration of Doppler-free polarization spectroscopy of the D2 line of 6Li atoms. Counterintuitively, the presence of an Ar buffer gas, in a certain pressure ra…
Laser Phase and Frequency Stabilization Using Atomic Coherence
Yoshio Torii, Hideyasu Tashiro, Nozomi Ohtsubo +1
We present a novel and simple method of stabilizing the laser phase and frequency by polarization spectroscopy of an atomic vapor. In analogy to the Pound-Drever-Hall method, which…