title: Continuous-wave, single-frequency 229  nm laser source for laser cooling of cadmium atoms.
abstract: Continuous-wave output at 229 nm for the application of laser cooling of Cd atoms was generated by the fourth harmonic using two successive second-harmonic generation stages. Employing a single-frequency optically pumped semiconductor laser as a fundamental source, 0.56 W of output at 229 nm was observed with a 10-mm long, Brewster-cut BBO crystal in an external cavity with 1.62 W of 458 nm input. Conversion efficiency from 458 nm to 229 nm was more than 34%. By applying a tapered amplifier (TA) as a fundamental source, we demonstrated magneto-optical trapping of all stable Cd isotopes including isotopes Cd111 and Cd113, which are applicable to optical lattice clocks.
authors.forename: Yushi
authors.initials: Y
authors.lastname: Kaneda
authors.forename: J M
authors.initials: JM
authors.lastname: Yarborough
authors.forename: Yevgeny
authors.initials: Y
authors.lastname: Merzlyak
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Keitaro
authors.initials: K
authors.lastname: Hayashida
authors.forename: Noriaki
authors.initials: N
authors.lastname: Ohmae
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Katori