Demonstration of a rapidly-swept external cavity quantum cascade laser for rapid and sensitive quantification of chemical mixtures

Conference · Sat Feb 13 00:00:00 EST 2016

DOI:https://doi.org/10.1117/12.2214200· OSTI ID:1239484

Brumfield, Brian E.; Taubman, Matthew S.; Phillips, Mark C.

A rapidly-swept external cavity quantum cascade laser (ECQCL) system for fast open-path quantification of multiple chemicals and mixtures is presented. The ECQCL system is swept over its entire tuning range (>100 cm-1) at frequencies up to 200 Hz. At 200 Hz the wavelength tuning rate and spectral resolution are 2x104 cm-1/sec and < 0.2 cm-1, respectively. The capability of the current system to quantify changes in chemical concentrations on millesecond timescales is demonstrated at atmospheric pressure using an open-path multi-pass cell. The detection limits for chemicals ranged from ppb to ppm levels depending on the absorption cross-section.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1239484
• Report Number(s): PNNL-SA-115956; NN2001000
• Resource Relation: Conference: Quantum Sensing and Nano Electronics and Photonics XIII, February 13, 2016, San Francisco, California. Proceedings of the SPIE, 9755:Paper No. 975509
• Country of Publication: United States
• Language: English