High-efficient 650 nm laser bars with an output power of about 10 W and a wall-plug efficiency of 30%

Published in:
Proceedings SPIE, vol. 6133, "Novel In-Plane Semiconductor Lasers V", 78-85 (2006).
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Abstract:
In this paper, results for 650 nm high-power broad area lasers and bars will be presented. The optimized layer structure consists of GaInP quantum wells embedded in AlGaInP waveguide layers. The n-cladding layer consists of AlInP, the p-cladding layer of AlGaAs. The vertical far field of this structure has a width below 32° (FWHM). Devices were fabricated and mounted p-side down on CuW heat spreader using AuSn solder. Broad area lasers reach a maximum output power of 0.94 W at 15°C limited only by thermal rollover. Up to now reliable operation at 500 mW over 6300 h was achieved. The spectral width of the emission is below 1 nm (FWHM). Bars consisting of 19 emitters with 30 µm x 750 µm reached a maximum output power of 9.6 W and a wall-plug efficiency of 30%. Reliable operation from a 5 mm bar at 5 W and 15°C over 1500 h was shown.

Keywords:
red-emitting lasers, diode lasers, high-power, reliability

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