A robust, miniaturized cavity ring-down spectrometer has been developed as a laboratory demonstration model for future CubeSat deployments of near- and mid-infrared spectrometers for in situ planetary science. The spectrometer is compact enough to ensure compatibility with standard CubeSat spacecraft buses, with a probed gas volume of less than 2.5 cc to ease mass, volume, and power requirements of sample gas handling subsystems. When operated at 1.39 mu m for water vapor isotope measurements, a noise-equivalent absorption coefficient of 3.7 x 10(-9) cm(-1) Hz(-1/2) is obtained. Oxygen isotope measurements were performed to demonstrate scanning performance. The spectrometer has been designed to use only components with functional equivalents throughout the 1-5 mu m range to maintain flexibility across a wide array of planetary science targets. Preliminary results from a 3.27 mu m implementation intended for methane measurements are also presented. (C) 2019 Optical Society of America.
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