Abstract

We have investigated the effects of laser bandwidth on quantitative cavity ring-down spectroscopy using the r R transitions of the b(υ = 0) ← X(υ = 0) band of molecular oxygen. It is found that failure to account properly for the laser bandwidth leads to systematic errors in the number densities determined from measured ring-down signals. When the frequency-integrated expression for the ring-down signal is fitted and measured laser line shapes are used, excellent agreement between measured and predicted number densities is found.

© 1996 Optical Society of America

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