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Publications Past Presentations Patents Archives |
Acoustic Diagnostics Atomic Physics R&D Business Detector Physics DIAL/LIDAR Systems Diode Laser Sensors Dye Lasers Environmental Monitoring Fluid Dynamics Fuel Cells Microwave Physics High Speed Imaging Hypervelocity Impact Instrumentation Laser Devices Laser Diagnostics Metals Monitoring Ocean Sciences Optical Systems Solar Energy Space Environment Wind Tunnel Testing |
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C.M. Gittins, E.T. Wetjen, C. Gmachl, F. Capasso, A.L. Hutchinson, D.L. Sivco, J.N. Baillargeon, A.Y. Cho, "Quantitative Gas Sensing by Backscatter-Absorption Measurements of a Pseudo-Random Code Modulated λ~ 8 µm Quantum Cascade Laser," Optics Letters 25 (16) , 1162-1164 (15 August2000).
AbstractWe have demonstrated quantitative chemical vapor detection using a multi-mode quantum cascade (QC) laser. Experiments incorporated Pseudo-Random Code (PRC) modulation of the laser intensity to enable sensitive absorption measurements of isopropanol vapor at 8.0 µm. The demonstration shows the viability of one technical approach for implementing low peak power QC lasers in the transmitter portion of a differential absorption lidar (DIAL) system. Using a 31 chip, 300 ns per chip PRC sequence, the measured isopropanol detection limit was 12 ppmv-m (~3 × 10-3 absorption) for a simple backscatter-absorption measurement configuration. KeywordsDIAL, Infrared and far-infrared lasers,sr-1004
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