Abstract

The optical design of an absorption spectrometer for in situ measurements of atmospheric trace gases is reported. The light source is a rapidly tuned and power-stabilized dye-ring laser, which is frequency doubled by an intracavity BBO crystal. The second harmonic and the fundamental are used simultaneously for measurement of OH, SO₂, CH₂O, and naphthalene in the UV and of NO₂ in the visible. The 1.2-km absorption path is folded within a 6-m White-cell-type multiple-reflection system with an open-path setup. The absorption sensitivity of the spectrometer is better than 1 part in 10⁻⁵ under tropospheric conditions (integration time 1 min., signal-to-noise ratio 1).

© 1996 Optical Society of America

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