MIOMD-XI Speakers    
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1.  Mr. Michael Witzan, Johannes Kepler University Linz, AUSTRIA
Late-Breaking Results: Comparison of MIR PbTe and PbSe quantum well microdisk lasers
Speaker Biography: Michael Witzan started his study in technical physics at the Johannes Kepler University of Linz, Austria, in 2003. In 2010 he began to work on his master thesis in the IV-VI semiconductor research group of Prof. Gunther Springholz. Currently, he is finishing the master thesis and will start right afterwards with his Ph.D in the group of Prof. Springholz at JKU. His current research interests include the design, fabrication and characterization of IV-VI semiconductor structures and devices.

Summary: Coherent mid-infrared (MIR) optical emitters are extremely useful for high-sensitive gas analysis. For such devices, the lead salt compounds are very well suited because of their favorable optically direct band structure and low nonradiative Auger recombination rates. In particular, their wide wavelength tunability makes IV-VI lasers attractive for spectroscopy application. Up to now, however, continuous-wave operation was limited to 135 K for VCSELs and 223 K for edge emitters. In this work, we realized optically pumped microdisk lasers with PbTe/PbSrTe quantum well as active regions. Similar to our previews work we varied the single PbTe quantum well thickness, and compared the result with microdisk lasers based on PbSe quantum wells. The maxium cw-mode laser operation temperature of PbTe/PbSrTe microdisk lasers are around 100 K lower than the PbSe/PbSrSe microdisk.
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