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Ultra-high-finesse NICE-OHMS spectroscopy at 1532 nm for calibrated online ammonia detection.

Curtis, E A; Barwood, G P; Huang, G; Edwards, C S; Gieseking, B; Brewer, P J (2017) Ultra-high-finesse NICE-OHMS spectroscopy at 1532 nm for calibrated online ammonia detection. J. Opt. Soc. Am. B, 34 (5). pp. 950-958.

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There is increasing industrial demand, particularly within the clean room community, for rapid online measurement of a number of airborne molecular contaminants (AMCs). These measurements are usually made with commercially available cavity ring-down spectrometers, but more recently developed techniques offer potentially better sensitivity and more rapid sampling. In this paper we present ammonia spectroscopy data from a newly-developed NICE-OHMS system at 1532 nm, which is designed to be transportable and operate in an industrial environment. We demonstrate this using an optical cavity of 9 kHz fringe width (~ 1.5 GHz free spectral range and finesse 169,000) and a distributed feedback diode laser with a relatively broad ~ 1 MHz free running linewidth. To our knowledge, this is the highest cavity finesse for which NICE-OHMS has been demonstrated. The variation in NICE-OHMS ammonia signal amplitude is presented at different concentrations in one atmosphere of nitrogen, generated from traceable reference standards, with a flow rate of 1-2 l/min. We derive a calibration curve for our device for concentrations in the range from 100 nmol/mol to 10 µmol/mol.

Item Type: Article
Keywords: Molecular spectroscopy, heterodyne spectroscopy, instrument, NICE-OHMS
Subjects: Time and Frequency
Time and Frequency > Optical Frequency Standards and Metrology
Divisions: Quantum Science
Identification number/DOI: 10.1364/JOSAB.34.000950
Last Modified: 02 Feb 2018 13:12
URI: http://eprintspublications.npl.co.uk/id/eprint/7542

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