An infrared laser spectrometer based on difference-frequency generation in {\text{LiIO}}_{\text{3}} is described. The spectrometer has a frequency uncertainty of less than 1 MHz and a signal-to-noise ratio between 3000:1 and 10,000:1. These properties allow the spectrometer to be used for studies of the non-Lorentzian and non-Voigt character of absorption line shapes in atmospheric trace gases.

© 2007 Optical Society of America

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