High-power diode laser bars >250 W

Summary form only given. High-power laser bars become more and more important for pumping of solid state lasers, medical applications, materials processing like cutting and welding, and for surface treatment. One of the key requirements for these bars is high output power together with a high electro-optical conversion efficiency, which yields low power dissipation In order to achieve highest output powers we fabricated 1 cm wide arrays with 50 % fill factor. Each bar comprises 25 emitters with an individual aperture of 200 /spl mu/m. A resonator length of 2 mm was chosen in order to reduce the ohmic resistances. The AlGaAs-InGaAs layer sequence with a single InGaAs quantum well as the active region was grown by MBE.