Abstract

The high detection sensitivity available from intracavity laser spectroscopy (ILS) is extended into the near infrared by solid-state laser systems operating with relatively narrow (∼0.002 µm) bandwidths for three CO2 absorption features of importance to an understanding of planetary atmospheres. The absolute intensities and pressure-broadening properties of the P(12), P(14), and P(16) lines of the Σ–Σ band (12°1–00°0) of CO2 (at 2.0129, 2.0136, and 2.0143 µm) are measured quantitatively by ILS with a Tm:YAG laser operating near 2.0 µm. The temperature dependencies of these absolute intensities and collisional-broadening parameters for these three CO2 features are also measured over the 110–300 K range. The 3.0-km equivalent absorption path length available from the ILS Tm:YAG system is used to enhance detection sensitivity by more than a factor of 1.5 × 104 while maintaining a physical sample cell path length of ∼20 cm. The enhanced detection sensitivity of ILS permits absolute intensities and collisional-broadening parameters to be measured from <1-Torr CO2 over a series of temperatures, conditions that emulate those found in the atmospheres of Mars, Triton, and Venus.

© 2001 Optical Society of America

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