Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 4: Semiconductor Laser I

HL 4.5: Talk

Monday, March 26, 2007, 11:45–12:00, H13

Tunable two color semiconductor lasers — •Carsten Brenner, Claus-Stefan Friedrich, Michael Breede, Stefan Hoffmann, and Martin Hofmann — AG Optoelectronic devices and materials, Ruhr-University Bochum, IC 2/133, Universitätsstr. 150, 44780 Bochum, Germany

We present different concepts for tunable two color and multimode emission by semiconductor lasers. These systems are particularly interesting for terahertz generation, telecommunications and spectroscopy. Simultaneous lasing on different frequencies is achieved using three different external cavity setups:

The first design is based on a structured end mirror in an external cavity. The emitted frequencies are selected by the geometry of the mirror. For the second configuration the end mirror of the external cavity is replaced by a digital micromirror device, hence the tuning can be achieved all electrically without any moving mechanical parts. To improve the spectral purity of the two colors we introduce a final setup incorporating a prism to achieve a double Littman geometry. In this layout both frequencies can be tuned separately.