Title :
High-power 1.9-μm diode laser arrays with reduced far-field angle
Author :
Kelemen, M.T. ; Weber, J. ; Rattunde, M. ; Kaufel, G. ; Schmitz, J. ; Moritz, R. ; Mikulla, Michael ; Wagner, J.
Author_Institution :
Fraunhofer Inst. for Appl. Solid State Phys., Freiburg
Abstract :
High-power 1.91-mum (AlGaIn)(AsSb) quantum-well diode laser single emitters and linear arrays with improved waveguide design were fabricated and characterized. The use of a rather narrow waveguide core results in a remarkable low fast axis beam divergence of 44deg full-width at half-maximum. For single emitters, a continuous-wave (CW) output power of nearly 2 W has been observed. We have achieved 16.9 W in CW mode at a heat sink temperature of 20degC. The efficiencies of more than 25% are among the highest values reported so far for GaSb-based diode lasers, and allow the use of passively cooled and, thus, less expensive heat sink technologies
Keywords :
laser beams; laser modes; laser transitions; optical design techniques; optical fabrication; quantum well lasers; semiconductor laser arrays; waveguide lasers; (AlGaIn)(AsSb) quantum-well diode laser arrays; 1.91 mum; 16.9 W; 20 degC; AlGaInAsSb; CW mode; beam divergence; heat sink; narrow waveguide core; passive cooling; single emitters; waveguide design; Biomedical optical imaging; Diode lasers; Gas lasers; Optical arrays; Optical design; Optical pumping; Optical refraction; Optical variables control; Optical waveguides; Semiconductor laser arrays; Optical pumping; power lasers; semiconductor laser arrays; semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.870146
