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
Original Manuscript: October 13, 1995
Revised Manuscript: January 29, 1996
Published: July 20, 1996
Joseph T. Hodges, J. Patrick Looney, and Roger D. van Zee, "Laser bandwidth effects in quantitative cavity ring-down spectroscopy," Appl. Opt. 35, 4112-4116 (1996)