MIOMD-XI Speakers    
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1.  Dr. Andrew P. Ongstad, Air Force Research Lab. USA
Late-Breaking Results: High-peak power from optically-pumped mid-IR semiconductor lasers
Speaker Biography: Andrew P. Ongstad received his Ph. D. degree in chemistry from the University of Colorado, Boulder, CO. In 1991 he joined the Directed Energy Directorate at the Air Force Research Laboratory in Albuquerque, NM. He is one of the principle experimental scientist in the mid-infrared semiconductor research group. His current research interests include semiconductor laser physics, infrared spectroscopy, atomic and molecular chemistry, and optics.

Summary: We describe high peak-power, broad area mid-infrared semiconductor lasers. The laser structures incorporated 14 type-II quantum wells imbedded in thick waveguide/absorber regions composed of InGaAsSb. The Fabry-Perot lasers were optically pumped with the output from a passively-Q-switched Ho:YAG laser capable of delivering 100 kW at 2.09 μm. The emission from the optically pumped semiconductor laser (OPSL) was near 4.1 μm. The emission was spectrally and temporally resolved and showed evidence for the creation of a hot-carrier population at the higher pump powers. A roll-over in the OPSL output power curve was observed at pump-powers greater than ~20 kW. The maximum single-ended OPSL power was near 470W.
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