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 °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.
© 2004 Optical Society of America
(140.2010) Lasers and laser optics : Diode laser arrays
(140.2020) Lasers and laser optics : Diode lasers
(140.3290) Lasers and laser optics : Laser arrays
(140.5960) Lasers and laser optics : Semiconductor lasers
Hirofumi Miyajima, Hirofumi Kan, Takeshi Kanzaki, Shin-ichi Furuta, Masanobu Yamanaka, Yasukazu Izawa, and Sadao Nakai, "Jet-type, water-cooled heat sink that yields 255-W continuous-wave laser output at 808 nm from a 1-cm laser diode bar," Opt. Lett. 29, 304-306 (2004)