title: Total-reflection active-mirror laser with cryogenic Yb:YAG ceramics.
abstract: An efficient high-power laser operation has been demonstrated by using a cryogenic Yb:YAG composite ceramic with a total-reflection active-mirror arrangement. The composite ceramic, which had no high-reflection coating and was cooled with liquid nitrogen directly, showed four-level operation even at 67 kW/cm(3) of high pump density. A 273 W cw output power was obtained with 65% optical efficiency and 72% slope efficiency.
authors.affiliation: Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka, Japan. furuse-h@ile.osaka-u.ac.jp
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Furuse
authors.forename: Junji
authors.initials: J
authors.lastname: Kawanaka
authors.forename: Kenji
authors.initials: K
authors.lastname: Takeshita
authors.forename: Noriaki
authors.initials: N
authors.lastname: Miyanaga
authors.forename: Taku
authors.initials: T
authors.lastname: Saiki
authors.forename: Kazuo
authors.initials: K
authors.lastname: Imasaki
authors.forename: Masayuki
authors.initials: M
authors.lastname: Fujita
authors.forename: Shinya
authors.initials: S
authors.lastname: Ishii
mesh_terms: D002516:Ceramics; D003080:Cold Temperature; D053844:Lasers, Solid-State; D015018:Ytterbium
chemical_list: D015018:Ytterbium