Abstract

Transmission spectroscopy over large spectral ranges (>100cm1) generally requires a reference measurement to be taken separately from the sample scan. The ratio of the two measurements (i.e., the transmittance) is therefore susceptible to baseline changes that occur between the recording of the two spectra. The origins of relatively strong baseline changes (1%) of a difference-frequency- generation-based laser spectrometer (tuning range 29003144cm1, 150μW average power) were investigated and a method for minimizing them by improving reproducibility and reducing measurement time is presented. The new method was tested for a gas mixture and the sensitivity for broad absorption features was determined as 5×103 minimum measurable absorbance for a total scan duration of 70min.

© 2011 Optical Society of America

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