MIOMD-XI Speakers    
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1.  Prof. Frank Tittel, Rice Univ., USA
Late-Breaking Results: Mid-Infrared semiconductor laser based trace gas sensor technologies: recent advances and applications
Speaker Biography: Frank Tittel (BA, MA, Ph.D. in physics) graduated from Oxford University in 1959. From 1959 to 1967 he was a Research Physicist with General Electric Research and Development Center, Schenectady, New York. Since 1967 he has been on the faculty of the Department of Electrical and Computer Engineering at Rice University in Houston, Texas. Current research interests include quantum electronics, especially laser spectroscopy, and applications in medicine, environmental monitoring, industrial process control and national security. Dr. Tittel is a Fellow of the IEEE, the Optical Society of America and the American Physical Society. He received a Doctor of Science (HC) degree from JATE University, Szeged, Hungary, in 1993.

Summary: This talk will focus on recent advances in the development of sensors based on infrared semiconductor lasers for the detection, quantification and monitoring of trace gas species and their application in atmospheric chemistry, medical diagnostics, life sciences, industrial process control and national security. The development of compact trace gas sensors, in particular based on quantum cascade and interband cascade lasers permit the targeting of strong fundamental rotational-vibrational transitions in the mid-infrared. The architecture and performance of several sensitive, selective and real-time gas sensors based on mid-infrared semiconductor lasers will be described. High detection sensitivity at ppbv and sub-ppbv concentration levels requires a sensitivity enhancement scheme such as an optical multipass gas cell, cavity absorption enhancement technique, or photo-acoustic absorption spectroscopy. These three spectroscopic methods can achieve minimum detectable absorption losses in the range from 10-8 to 10-11 cm-1/√Hz. Recent examples of real world applications of field deployable gas sensors will be described.
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