Abstract
We describe the performance of a high-sensitivity wavelength modulated cavity enhanced infrared tunable diode laser absorption spectrometer for the detection of water vapor in the 1.37 μm region. The spectrometer can measure a fractional absorption of ∼10<sup>−5</sup> for an absorption path length of a few kilometers. The instrument's sensitivity is more than sufficient to detect water isotopomers (H<sub>2</sub><sup>16</sup>O, H<sub>2</sub><sup>18</sup>O, HDO) at Martian atmospheric concentrations. The instrument is amenable to miniaturization, so a future compact, multiple-species version of the spectrometer will be highly suitable for <i>in situ</i> planetary exploration.
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