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Title: Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing

Abstract

The performance of a rapidly swept external cavity quantum cascade laser (ECQCL) system combined with an open-path Herriott cell was evaluated for time-resolved measurements of chemical species with broad and narrow absorption spectra. A spectral window spanning 1278 – 1390 cm-1 was acquired at a 200 Hz acquisition rate, corresponding to a tuning rate of 2x104 cm-1/s, with a spectral resolution of 0.2 cm-1. The capability of the ECQCL to measure < 100 ppbv changes in N2O and F134A concentrations on millisecond timescales was demonstrated in simulated plume studies with releases near the open-path Herriott cell. Absorbance spectra measured using the ECQCL system exhibited noise-equivalent absorption coefficients of 5x10-9 cm-1Hz-1/2. For a spectrum acquisition time of 5 ms, noise-equivalent concentrations (NEC) for N2O and F134A were measured to be 70 and 16 ppbv respectively, which improved to sub-ppbv levels with averaging to 100 s. Noise equivalent column densities of 0.64 and 0.25 ppmv x m in 1 sec are estimated for N2O and F134A.

Authors:
 [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1222058
Report Number(s):
PNNL-SA-111759
Journal ID: ISSN 1094-4087; OPEXFF; NN2001000
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 23; Journal Issue: 20; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 54 ENVIRONMENTAL SCIENCES; lasers; tunable; semiconductor lasers; quantum cascade; spectroscopy; infrared

Citation Formats

Brumfield, Brian E., Taubman, Matthew S., Suter, Jonathan D., and Phillips, Mark C. Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing. United States: N. p., 2015. Web. doi:10.1364/OE.23.025553.
Brumfield, Brian E., Taubman, Matthew S., Suter, Jonathan D., & Phillips, Mark C. Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing. United States. doi:10.1364/OE.23.025553.
Brumfield, Brian E., Taubman, Matthew S., Suter, Jonathan D., and Phillips, Mark C. Mon . "Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing". United States. doi:10.1364/OE.23.025553. https://www.osti.gov/servlets/purl/1222058.
@article{osti_1222058,
title = {Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing},
author = {Brumfield, Brian E. and Taubman, Matthew S. and Suter, Jonathan D. and Phillips, Mark C.},
abstractNote = {The performance of a rapidly swept external cavity quantum cascade laser (ECQCL) system combined with an open-path Herriott cell was evaluated for time-resolved measurements of chemical species with broad and narrow absorption spectra. A spectral window spanning 1278 – 1390 cm-1 was acquired at a 200 Hz acquisition rate, corresponding to a tuning rate of 2x104 cm-1/s, with a spectral resolution of 0.2 cm-1. The capability of the ECQCL to measure < 100 ppbv changes in N2O and F134A concentrations on millisecond timescales was demonstrated in simulated plume studies with releases near the open-path Herriott cell. Absorbance spectra measured using the ECQCL system exhibited noise-equivalent absorption coefficients of 5x10-9 cm-1Hz-1/2. For a spectrum acquisition time of 5 ms, noise-equivalent concentrations (NEC) for N2O and F134A were measured to be 70 and 16 ppbv respectively, which improved to sub-ppbv levels with averaging to 100 s. Noise equivalent column densities of 0.64 and 0.25 ppmv x m in 1 sec are estimated for N2O and F134A.},
doi = {10.1364/OE.23.025553},
journal = {Optics Express},
number = 20,
volume = 23,
place = {United States},
year = {2015},
month = {9}
}

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Cited by: 7 works
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    Works referencing / citing this record:

    Characterization of a swept external cavity quantum cascade laser for rapid broadband spectroscopy and sensing
    dataset, October 2015