title: Application of a broadly tunable SG-DBR QCL for multi-species trace gas spectroscopy.
abstract: Feasibility of using a mid-Infrared tunable sampled-grating distributed Bragg reflectors quantum cascade laser for high resolution multicomponent trace gas spectroscopy is demonstrated. By controlling the driving currents to the front and back sections of the laser, we were able to tune a pulsed 4.55 µm laser over a frequency range a of 30 cm(-1) with high resolution, accuracy and repeatability. The laser was applied to absorption spectroscopy of ambient and reduced pressure (150 Torr) air in a 205 meters multi-pass Herriott cell, and by using standard LSQ fitting to a spectral database of these trace gases (HITRAN), the concentrations of nitrous oxide, carbon monoxide, and water vapor were retrieved.
authors.forename: Abdou S
authors.initials: AS
authors.lastname: Diba
authors.forename: Feng
authors.initials: F
authors.lastname: Xie
authors.forename: Barry
authors.initials: B
authors.lastname: Gross
authors.forename: Lawrence C
authors.initials: LC
authors.lastname: Hughes
authors.forename: Chung-en
authors.initials: CE
authors.lastname: Zah
authors.forename: Fred
authors.initials: F
authors.lastname: Moshary