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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Acknowledgements
The financial support of the University of Helsinki and the Academy of the Finland is gratefully acknowledged. The University of Helsinki is acknowledged for funding the laboratory equipment used in this work. We also thank Dr. Florian Schmidt for useful discussions.
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Peltola, J., Vainio, M., Ulvila, V. et al. Off-axis re-entrant cavity ring-down spectroscopy with a mid-infrared continuous-wave optical parametric oscillator. Appl. Phys. B 107, 839–847 (2012). https://doi.org/10.1007/s00340-012-5074-x
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DOI: https://doi.org/10.1007/s00340-012-5074-x