title: Jet-type, water-cooled heat sink that yields 255-W continuous-wave laser output at 808 nm from a 1-cm laser diode bar.
abstract: A newly designed jet-type, water-cooled heat sink (the funryu heat sink, meaning fountain flow in Japanese) yielded 255-W cw laser output at 808 nm from a 1-cm bar made from InGaAsP/InGaP quantum-well active layers with a 67% fill factor [70 quantum-well laser diode (LD) array along the 1-cm bar]. A funryu heat sink measuring 1.1 mm in thickness gave the LD 0.25 degrees C/W thermal resistance, one of the lowest values achieved with a 1-cm LD bar. Over a short period of operation, the device reached a maximum cw power of 255 W. To the best of our knowledge, this is the highest power ever achieved in 808-nm LD operation. In the future, the funryu heat sink may be capable of 80-W cw operation over an extended lifetime of several thousand hours.
authors.affiliation: Central Research Laboratory, Hamamatsu Photonics K.K., 5000 Hirakuchi, Hamakita, Shizuoka 434-8601, Japan. miyajima@crl.hpk.co.jp
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Miyajima
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kan
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kanzaki
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Furuta
authors.forename: Masanobu
authors.initials: M
authors.lastname: Yamanaka
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Izawa
authors.forename: Sadao
authors.initials: S
authors.lastname: Nakai