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

Laurila, T. and Burns, I. S. and Hult, J. and Miller, J. H. and 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). pp. 271-278. ISSN 0946-2171

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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.