Off-axis re-entrant cavity ring-down spectroscopy with a mid-infrared continuous-wave optical parametric oscillator |
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| Authors: | J Peltola M Vainio V Ulvila M Siltanen M Metsälä L Halonen |
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| Institution: | 1. Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, A.I. Virtasen aukio 1, 00014, Helsinki, Finland
2. Centre of Metrology and Accreditation, P.O. Box 9, 02151, Espoo, Finland
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| Abstract: | We demonstrate an off-axis cavity ring-down spectroscopy system, which uses a mid-infrared continuous-wave optical parametric oscillator as a light source. Off-axis injection with re-entrant configuration of the ring-down cavity is used to achieve high spectral resolution while maintaining high measurement speed. This makes the setup suitable for sensitive molecular spectroscopy in the mid-infrared region, particularly for studies that require high temporal resolution. Formaldehyde (H2CO) absorption spectrum at 3.4 µm is measured using the off-axis re-entrant cavity ring-down spectrometer. |
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