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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15489–15502

Pulsed quantum cascade laser-based CRDS substance detection: real-time detection of TNT

C. C. Harb, T. K. Boyson, A. G. Kallapur, I. R. Petersen, M. E. Calzada, T. G. Spence, K. P. Kirkbride, and D. S. Moore  »View Author Affiliations

Optics Express, Vol. 20, Issue 14, pp. 15489-15502 (2012)

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This paper presents experimental results from a pulsed quantum cascade laser based cavity ringdown spectrometer used as a high-throughput detection system. The results were obtained from an optical cavity with 99.8% input and output coupling mirrors that was rapidly swept (0.2s to 7s sweep times) between 1582.25 cm−1 (6.3201μm) and 1697.00 cm−1 (5.8928μm). The spectrometer was able to monitor gas species over the pressure range 585 torr to 1μtorr, and the analysis involves a new digital data processing system that optimises the processing speed and minimises the data storage requirements. In this approach we show that is it not necessary to make direct measurements of the ringdown time of the cavity to obtain the system dynamics. Furthermore, we show that correct data processing is crucial for the ultimate implementation of a wideband IR spectrometer that covers a range similar to that of commercial Fourier transform infrared instruments.

© 2012 OSA

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(260.3060) Physical optics : Infrared
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:

Original Manuscript: March 29, 2012
Revised Manuscript: May 15, 2012
Manuscript Accepted: June 12, 2012
Published: June 25, 2012

C. C. Harb, T. K. Boyson, A. G. Kallapur, I. R. Petersen, M. E. Calzada, T. G. Spence, K. P. Kirkbride, and D. S. Moore, "Pulsed quantum cascade laser-based CRDS substance detection: real-time detection of TNT," Opt. Express 20, 15489-15502 (2012)

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