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Sensors 2010, 10(7), 6861-6900; doi:10.3390/s100706861
Review

Quantum Cascade Laser Absorption Spectroscopy as a Plasma Diagnostic Tool: An Overview

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Received: 8 June 2010 / Revised: 25 June 2010 / Accepted: 10 July 2010 / Published: 16 July 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)
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Abstract

The recent availability of thermoelectrically cooled pulsed and continuous wave quantum and inter-band cascade lasers in the mid-infrared spectral region has led to significant improvements and new developments in chemical sensing techniques using in-situ laser absorption spectroscopy for plasma diagnostic purposes. The aim of this article is therefore two-fold: (i) to summarize the challenges which arise in the application of quantum cascade lasers in such environments, and, (ii) to provide an overview of recent spectroscopic results (encompassing cavity enhanced methods) obtained in different kinds of plasma used in both research and industry.
Keywords: quantum cascade laser; infrared laser; absorption spectroscopy; plasma diagnostics; cavity enhanced spectroscopy; chemical sensing quantum cascade laser; infrared laser; absorption spectroscopy; plasma diagnostics; cavity enhanced spectroscopy; chemical sensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Welzel, S.; Hempel, F.; Hübner, M.; Lang, N.; Davies, P.B.; Röpcke, J. Quantum Cascade Laser Absorption Spectroscopy as a Plasma Diagnostic Tool: An Overview. Sensors 2010, 10, 6861-6900.

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