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A calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation

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Kaminski,  C. F.
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Laurila, T., Burns, I. S., Hult, J., Miller, J. H., & Kaminski, C. F. (2011). A calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation. APPLIED PHYSICS B-LASERS AND OPTICS, 102(2), 271-278. doi:10.1007/s00340-010-4044-4.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6A2D-F
Abstract
An efficient calibration method has been developed for broad-bandwidth cavity enhanced absorption spectroscopy. The calibration is performed using phase shift cavity ring-down spectroscopy, which is conveniently implemented through use of an acousto-optic tunable filter (AOTF). The AOTF permits a narrowband portion of the SC spectrum to be scanned over the full high-reflectivity bandwidth of the cavity mirrors. After calibration the AOTF is switched off and broad-bandwidth CEAS can be performed with the same light source without any loss of alignment to the set-up. We demonstrate the merits of the method by probing transitions of oxygen molecules O(2) and collisional pairs of oxygen molecules (O(2))(2) in the visible spectral range.