[printer friendly version]

SPECIAL AMO PHYSICS SEMINAR


"Mid-Infrared semiconductor laser based trace gas sensor technologies: "


Frank K. Tittel
Department of Electrical and Computer Engineering
Rice University


ABSTRACT 

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.


Wednesday, November 28, 2012
IQSE 578, 2:00 p.m.
Mitchell Physics Building


Department of Physics and Astronomy
Texas A&M University

(Coffee and Cookies to be served at 1:45 p.m.)