Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 43: Poster II

Q 43.7: Poster

Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof

Detailed investigations on novel TBR-diode-lasers in external resonators — •Mario Niebuhr, Christof Zink, Danilo Skoczowsky, Axel Heuer, and Ralf Menzel — Universität Potsdam, Institut für Physik und Astronomie, Photonik, Karl-Liebknecht-Straße 24-25, Haus 28, 14476 Potsdam

Laser diodes are cheap and effective light sources. They generally lack high output powers due to the small active volume and the corresponding low damage threshold. Within a reasonable scope one can therefore extend the active region. Such broad area laser diodes exhibit higher optical output powers up to tens of watts, but suffer from poor beam quality because of diminished mode selection.

Introducing a Transversal-Bragg-Resonance-(TBR-)grating alongside the core region results in a variable propagation loss depending on the transversal mode structure itself. One can thereby stimulate specific low loss resonance modes by using an external resonator assembly.

We were able to achieve transversal single mode operation with a quasi diffraction limited beam using TBR-diodes with various core geometries. The corresponding experimental results and the influence of the external resonator will be discussed. Furthermore computer simulations will be presented to understand the emission characteristics and obtain suggestions for improvements.