Abstract

Rapid cavity ringdown measurements of multiple broadband absorbing species (methanol and isopropanol) in gas mixtures have been recorded with two multiplexed continuous-wave distributed-feedback diode lasers operating near 1.4 µm. A measurement sensitivity of 2.4 × 10^-9 cm^-1 for a 4.3-s averaging time was achieved in a 39.5-cm-long static cell with 99.94% reflectivity mirrors. This corresponds to a water-vapor detection limit of less than 2 ppb (parts in 10⁹) for the strong H₂O lines near 1.4 µm. The shot-to-shot noise of the decay time constant τ was approximately 0.3–0.7%, and ringdown acquisition rates as great as 900 Hz were achieved.

© 2000 Optical Society of America

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