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Q: Fachverband Quantenoptik und Photonik

Q 29: Laserentwicklung: Nichtlineare Effekte 1

Q 29.9: Vortrag

Mittwoch, 16. März 2011, 12:30–12:45, SCH 251

Characterization and modelling of novel TBR laser diodes at 980 nm — •Chistof Zink, Danilo Skoczowsky, Andreas Jechow, Axel Heuer, and Ralf Menzel — Universität Potsdam, Institut für Physik und Astronomie, Photonik, Karl-Liebknecht-Straße 24–25, Haus 28, 14476 Potsdam

Broad area (BA) lasers are the most efficient light sources available, but suffer from poor beam quality due to the lack of tranversal mode selection. By incorporating a transverse Bragg grating into a BA laser diode it is possible to select one transversal mode. The resulting transverse Bragg resonance (TBR) waveguide can be designed to have a single transversal mode that is distributed throughout the entire width of the laser for efficient, stable and single transversal mode operation even at high output powers. In addition the modal gain at the desired lasing frequencies can be increased by designing the dispersion of the TBR modes. This concept promises higher output powers and improved efficiency compared to traditional index-guided laser diodes. Detailed measurements of several lasers with different dimensions and numbers of quantum wells will be presented. The TBR lasers were also operated in an external resonator which allows selecting different types of modes. Finally, a simple model will be introduced which describes the emission characteristics of the different lasers.