Near 1 kW of Continuous-Wave Power From a Single High-Efficiency Diode-Laser Bar

Author

Li, Hanxuan ; Towe, Terry ; Chyr, Irving ; Brown, Denny ; Nguyen, Touyen ; Reinhardt, Frank ; Jin, Xu ; Srinivasan, Raman ; Berube, Myra ; Truchan, Tom ; Bullock, Robert ; Harrison, James

Author_Institution

Spectra-Phys. Lasers, Tucson

Volume

19

Issue

13

fYear

2007

fDate

7/1/2007 12:00:00 AM

Firstpage

960

Lastpage

962

Abstract

Near 1 kW of continuous-wave output power has been obtained from a single 1-cm-wide diode-laser bar. Mounted on a water-cooled microchannel heat sink, the operating wavelength was near 940 nm (at ~400 W) and the measured thermal resistance was as low as 0.08degC/W. Maximum power conversion efficiencies (PCEs) of 70% and 67% were obtained from high-fill-factor bars with cavity lengths of 4 and 5 mm, respectively. A maximum PCE of 72.2% was achieved with 3-mm broad-area single emitters. On-going lifetime data may signal the stable operation at unprecedented powers.

Keywords

laser beams; laser cavity resonators; laser reliability; laser stability; semiconductor lasers; thermal resistance; broad-area single emitters; continuous-wave laser power; continuous-wave power; efficiency 67 percent; efficiency 70 percent; high-fill-factor bars; power 1 kW; power conversion efficiencies; single high-efficiency diode-laser bar; size 1 cm; size 4 mm; size 5 mm; stable operation; thermal resistance; water-cooled microchannel heat sink; wavelength 940 nm; Diodes; Electrical resistance measurement; Heat sinks; Length measurement; Microchannel; Power generation; Power measurement; Thermal resistance; Water heating; Wavelength measurement; Laser bars; laser diodes; quantum conversion efficiency; quantum-well laser;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.898820

Filename

4220747