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

T. Laurila, I.S. Burns, J. Hult, J.H. Miller and C.F. Kaminski, "A calibration method for broad bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation", Applied Physics B, Vol. 102(2), 271-278, (2011), DOI:10.1007/s00340-010-4044-4 | pdf 


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 O2 and collisional pairs of oxygen molecules (O2) 2 in the visible spectral range.