, Volume 75, Issue 6-7, pp 745-750

Cavity-enhanced absorption spectroscopy with a rapidly swept diode laser

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Cavity-enhanced absorption spectroscopy is explained in terms of the transmission function of a rapidly swept interferometer, and the integrated transmission is shown to be proportional to the cavity ringdown time. The technique is demonstrated on the b1Σg +-X3Σg -  (1,0) band in molecular oxygen at 687 nm using a tunable diode laser and a relative-ly high-Q optical cavity (finesse ≈4000). A detection limit of 3×10-8 cm-1 s1/2 is achieved for a 0.8 cm-1 scanning range.

Received: 24 June 2002 / Revised version: 5 August 2002 / Published online: 15 November 2002
ID="*"Corresponding author. Fax: +44-1865/275410, E-mail: peverall@physchem.ox.ac.uk