Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 33: Laser Development: Semiconductor Lasers / Nonlinear Effects II

Q 33.4: Vortrag

Mittwoch, 10. März 2010, 14:45–15:00, F 128

Characterization of novel TBR laser diodes at 980nm — •Christof Zink, Danilo Skoczowsky, Andreas Jechow, Axel Heuer, and Ralf Menzel — Universität Potsdam, Institiut für Physik und Astronomie, Lehrstuhl Photonik, Karl-Liebknecht-Straße 24-25, 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 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. Preliminary measurements of different laser samples with two or three quantum well structures and a Bragg grating with grating period of 3μm will be presented. Furthermore, the TBR lasers were operated in an external resonator which allows selecting different types of modes.