MIOMD-XI Speakers    
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1.  Prof. Kumar Patel, UCLA/Pranalytica Inc, USA
Plenary Talk: Advances in high power quantum cascade lasers and applications
Speaker Biography: C. Kumar N. Patel is the President and CEO of Pranalytica, which is the premier designer, manufacturer and supplier of high power quantum cascade lasers and sensors for the detection of chemical warfare agents, explosives and toxic industrial chemicals and environmental pollutants. He is also a Professor of Physics & Astronomy at UCLA. He is the inventor of the carbon dioxide lasers and has been active in the area of lasers since 1961. He is a member of the National Academy of Science and National Academy of Engineering. In 1996, he was awarded the National Medal of Science by the president of the United States of America. In 2012, he was inducted in the National Inventors Hall of Fame for his invention of the carbon dioxide laser.

Summary: The importance of semiconductor lasers that operate in the MWIR and LWIR spectral regions at room temperature has long been recognized for a plethora of applications. With the first demonstration of the quantum cascade laser (QCL) by Capasso and his colleagues at Bell Labs in 1994, the interest in this area has escalated, especially after the first observation of continuous wave, room temperature operation of QCLs by Faist and his colleagues in 2002, through the utilization of a the two phonon resonance concept for depopulating the lower laser level in the QCL. This was followed by significant improvements in QCL performance by Razeghi and her group. We have advanced the design concepts significantly by introducing a new structure design called the nonresonant extraction, which permits an enormous flexibility for optimizing the laser performance, which includes higher output powers, higher wall plug efficiencies at the maximum power output and extension of available high power QCL to a broad spectral region. These improvements include the availability of CW/RT powers of >2 W (single emitter, collimated output) in the 3.8 μm to 4.2 μm region, >4 W in the 4.4 μm to 5.0 μm region and ~ 2W in the 7 μm to 10 μm regions. These improvements together with our demonstration of environmental ruggedness of QCLs against vibration, shock and wide temperature changes, has opened up a number applications where the compact, high power, high wall plug efficiency, rugged and reliable QCLs are making very rapid inroads. I will provide details of the performance improvements together with the key applications where the QCLs are seen as the preferred sources of high power infrared radiation.
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