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External cavity diode laser-based detection of trace gases with NICE-OHMS using current modulation
Umeå University, Faculty of Science and Technology, Department of Physics.
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2015 (English)In: Optics Express, ISSN 1094-4087, Vol. 23, no 5, 6277-6282 p.Article in journal (Refereed) Published
Abstract [en]

We combine an external cavity diode laser with noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) using current modulation. With a finesse of 1600, we demonstrate noise equivalent absorption sensitivities of 4.1 x 10(-10) cm(-1) Hz(-1/2), resulting in sub-ppbv detection limits for Doppler-broadened transitions of CH4 at 6132.3 cm(-1), C2H2 at 6578.5 cm(-1) and HCN at 6541.7 cm(-1). The system is used for hydrogen cyanide detection from sweet almonds.

Place, publisher, year, edition, pages
2015. Vol. 23, no 5, 6277-6282 p.
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:umu:diva-102453DOI: 10.1364/OE.23.006277ISI: 000350878500077OAI: diva2:814230
Available from: 2015-05-26 Created: 2015-04-26 Last updated: 2015-05-26Bibliographically approved

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Axner, Ove
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