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

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.23.025553· OSTI ID:1222058

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.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1222058
Report Number(s):
PNNL-SA-111759; OPEXFF; NN2001000
Journal Information:
Optics Express, Vol. 23, Issue 20; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (2)

Real-time breath gas analysis of CO and CO2 using an EC-QCL journal April 2017
A fast approximation for adaptive wavelength selection for tunable infrared chemical sensors journal October 2019