High-sensitivity spectroscopy of CO2 around 4.25 mu m with difference-frequency radiation

Year: 2002

Authors: Mazzotti D., Giusfredi G., Cancio P., De Natale P.

Autors Affiliation: Istituto Nazionale Di Ottica Applicata (INOA), Largo Fermi 6, 50125 Firenze FI, Italy; European Laboratory for Nonlinear Spectroscopy (LENS), Largo Fermi 2, 50125 Firenze FI, Italy; Istituto Nazionale Per La Fisica Della Materia (INFM), Largo Fermi 2, 50125 Firenze FI, Italy

Abstract: We demonstrate the possibility to perform very high-sensitivity spectroscopy Of CO2 around 4.25 mum wavelength, by use of a difference-frequency radiation source and a White-type multipass absorption cell. Several methods for fringing noise reduction were successfully adopted. In particular, a novel technique to reduce fringes by choosing proper values of the frequency modulation amplitude is described in detail. Pressure-broadening measurements of high-J rovibrational transitions are presented. Achievable laboratory and field sensitivity limits are discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.


Volume: 37 (2-3)      Pages from: 143  to: 158

More Information: The authors acknowledge G. Di Lonardo for the multipass cell facility and P. Bianchi for manufacturing the cell mirrors. We wish to thank the Gruppo Nazionale per la Vulcanologia and Istuto Nazionale di Geofisica e Vulcanologia (GNV-INGV for supporting this work (project O2 of Programma Quadro Triennale 2000–2002).
KeyWords: Difference-frequency generation; High sensitivity; Multipass absorption cell; Carbon dioxide; Frequency modulation; Gas absorption; Noise abatement; Spectroscopic analysis, High sensitivity spectroscopy; Trace gas detection, Laser optics
DOI: 10.1016/S0143-8166(01)00082-3

Citations: 16
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