Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Semiconductor laser I: VECSEL and cascade lasers

HL 70.3: Vortrag

Mittwoch, 2. April 2014, 15:30–15:45, POT 112

In-phase supermode emission based on an evanescently coupled semiconductor laser array — •Alexander Reinhold1, Christian Zimmermann1, Julian Scheuermann1, Wolfgang Zeller1, Johannes Koeth1, and Martin Kamp21nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, D-97218 Gerbrunn, Germany — 2Technische Physik and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Various fields of application demand compact, low cost, coherent light sources with high brilliance and emission of a single spectral mode. Suitable monolithic device concepts like semiconductor ridge waveguide arrays are extremely promising to achieve a narrow beam divergence with a high optical output power. Such arrays exhibit lateral mode coupling of adjacent ridge waveguides, leading to a distinct number of index guided supermodes with a large mode extension at the facet. For an array with a predefined number of ridge waveguides, coupled mode analysis postulates a distinct number of allowed supermodes with only the first order in-phase supermode exhibiting lateral single lobe emission. We have designed and fabricated arrays based on an AlGaAs/GaAs laser structure with an InGaAs double quantum well active region. In order to obtain devices with spectral single mode emission we have also realised arrays with wavelength selective elements. We achieved in-phase supermode emission with a lateral beam divergence of 5,6 ° at full width half maximum (FWHM) and optical output powers beyond 100 mW.

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