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Proceedings Paper

High-power high-brightness ridge-waveguide tapered diode lasers at 14xx nm
Author(s): Senta Kallenbach; Marc T. Kelemen; Rolf Aidam; Rainer Losch; Gudrun Kaufel; Michael Mikulla; Guenter Weimann
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Paper Abstract

High-power spatially single-mode diode lasers at 1.4 - 1.5 μm wavelength are of interest as pump lasers for Raman and rare-earth doped fiber amplifiers as well as for material processing and for Light Detection and Ranging (LIDAR) at eye-safe wavelengths. A cost-efficient way to realize high-power high-brightness devices is the tapered resonator concept. We demonstrate InGaAsP/InP based diode lasers with compressively strained quantum wells and wavelengths around 1480 nm which were grown by solid source MBE. From broad area lasers with variations in quantum well number and waveguide layer thickness, parameters for the logarithmic gain model are deduced. With their implementation in 2-dimensional BPM simulations, an optimized resonator geometry is derived. Devices employ a 500 μm ridge section followed by a 2000 μm taper section with 6° angle. Continuous-wave (cw) output powers reach more than 1.5 W. Beam quality is characterized in terms of near field and far field distribution, M2, and astigmatism. An excellent agreement is found between measurement and simulation. For narrow-linewidth operation, devices are provided with anti-reflection coatings on both facets and spectrally stabilized with an external grating. We achieve 0.7 W single mode power and a side mode suppression ratio (SMSR) of 42 dB. Reliability is tested in terms of facet stability and lifetime. Pulsed measurements reveal a power stability up to more than 5 MW/cm2. From cw aging tests at 1 W output power, lifetimes of about 6,000 h are extrapolated.

Paper Details

Date Published: 1 April 2005
PDF: 10 pages
Proc. SPIE 5738, Novel In-Plane Semiconductor Lasers IV, (1 April 2005); doi: 10.1117/12.588514
Show Author Affiliations
Senta Kallenbach, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Marc T. Kelemen, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Rolf Aidam, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Rainer Losch, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Gudrun Kaufel, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Michael Mikulla, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Guenter Weimann, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)

Published in SPIE Proceedings Vol. 5738:
Novel In-Plane Semiconductor Lasers IV
Carmen Mermelstein; David P. Bour, Editor(s)

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