• Erwan Normand

    Technical Director, Cascade Technologies

    Erwan Normand is technical director at Cascade Technologies (Glasgow, Scotland).

    Courtesy of Cascade Technologies
    The advantages of the QC laser have been harnessed in a commercialized gas-sensor platform (top). This platform can switch up to four lasers to eight measurement points simultaneously. In a typical emissions-monitoring application (bottom), design features such as fiber coupling and in situ probes improve measurement integrity.
    Erwan Normand
    April 1, 2007
    Extensive research and manufacturing improvements are delivering the output power levels and spectral behavior necessary to prove quantum-cascade lasers viable for commercial ...
    FIGURE 1. Raw data for background and transmission spectra of room air was recorded using a 1270-cm-1 QC laser with intrapulse spectroscopy. A 2000-ns pulse is applied to the laser resulting in a frequency chirp, which sweeps the laser through the spectroscopic transitions of interest. A 0.048-cm-1 germanium etalon signal confirms greater than 6-cm-1 single-mode tuning.
    Iain Howieson
    March 1, 2005
    Innovative spectroscopic techniques and advances in spectrometer hardware promise major performance and cost improvements in tunable diode-laser absorption gas sensors.