Laser based trace gas detection

Laser and interferometric instrumentation for spectroscopy

Laser-based spectroscopic techniques are outstanding for a variety of applications. Of special importance is their ability to detect the presence of small or unknown concentrations of species in gas phase (atoms or molecules) under various types of conditions. There is number of laser-based techniques that have been developed during the years. Their general denominator is that they generally present high sensitivity, speed of operation and selectivity. A major interest of our group is to develop such techniques, with the following additional advantages: broad simultaneous spectral coverage, infrared operation, ability to measure concentrations or accurate line parameters. We apply then these techniques to trace gas detection and high sensitivity molecular spectroscopy.		From left to right: Hervé Herbin, Fatou Gueye, Nathalie Picqué, Véronique Girard (April 2004).
More details may be found in: Time-resolved Fourier transform intracavity spectroscopy with a Cr²⁺:ZnSe laser N. Picqué, F. Gueye, G. Guelachvili, E. Sorokin, I.T. Sorokina, Optics Letters 30, 3410-3412 (2005). High-sensitivity time-resolved intracavity laser Fourier transform spectroscopy with vertical cavity surface emitting multiple quantum well lasers, N. Picqué, G. Guelachvili, A.A Kachanov, Optics Letters 28, 313-315, 2003.