TY - CONF AU - Knabe, Kevin AU - Williams, Paul AU - Giorgetta, Fabrizio AU - Armacost, Chris AU - Radunsky, Michael AU - Newbury, Nathan C2 - Proceedings of Laser Applications to Chemical, Security and Environmental Analysis, San Diego, CA DA - 2012-01-25 LA - en PB - Proceedings of Laser Applications to Chemical, Security and Environmental Analysis, San Diego, CA PY - 2012 TI - Frequency Characterization of an External-Cavity Quantum Cascade Laser at 4.5 υm using a Frequency Comb ER -