G. Erbert , J. Fricke, R. Hülsewede, A. Knauer, W. Pittroff, P. Ressel, J. Sebastian, B. Sumpf, H. Wenzel and G. Tränkle

Published in:

Proceedings of SPIE Vol. 4995 (2003).

Abstract:

Tensile strained GaAsP quantum wells embedded in AlGaAs waveguide structures are used to realize high power, high brightness short wavelength tapered laser diodes. At 735 nm these laser diodes show up to 3 W nearly diffraction limited output power with a wall plug efficiency of about 40 %. Single spectral mode behavior is observed at output power levels up to 1 W.
From aging test a high reliability with lifetime exceeding 5000 can be derived comparable to results obtained from broad area laser diodes with the same aperture width. There are only small changes of the beam quality during aging.
In conclusion it is shown that well designed tapered laser are a step forward to high efficient, diffraction limited light sources in the Watt-range which can easily fabricated in high volumes.

Keywords:
high power diode lasers, tensile strained quantum wells, beam quality, reliability

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