MIOMD-XI Speakers    
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1.  Prof. Dan Botez, Univ. of Wisconsin-Madison, USA
Invited Talk: Two-Dimensional Conduction-Band Engineering: Achieving Ultimate Wallplug Efficiency and Reliability for Quantum Cascade Lasers
Speaker Biography: Dan Botez has received his B.S., M.S. and Ph.D. degrees in Electrical Engineering from University of California, Berkeley. He has carried out research at RCA Labs, TRW Inc., and is currently the Philip Dunham Reed Professor of Engineering at University of Wisconsin-Madison. He has published over 370 papers and holds 48 patents.

Summary: Tapered-Active (TA) quantum-cascade lasers (QCLs) are devices for which the barrier heights in their active regions increase in energy from the injection to the exit barriers. The TA design leads to carrier-leakage suppression because the energy difference between the upper lasing level and the next higher energy level, E(54) significantly increases. The mechanisms behind the E(54) increase are elucidated. An optimized 4.7 μm-emitting TA-QCL provides an E(54) value as high as 99 meV. Then the relative carrier leakage is ≤ 1% and, at 300 K, front-facet, CW wallplug-efficiency values of 27 % become possible.
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