Design of a difference-frequency infrared laser spectrometer for absorption line-shape studies

摘要

An infrared laser spectrometer based on difference-frequency generation in LiIO_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.