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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 15 — May. 20, 2001
  • pp: 2551–2560

Absolute Intensities and Pressure-Broadening Coefficients of 2-μm CO2 Absorption Features: Intracavity Laser Spectroscopy

Jihong Geng, Jonathan I. Lunine, and George H. Atkinson  »View Author Affiliations


Applied Optics, Vol. 40, Issue 15, pp. 2551-2560 (2001)
http://dx.doi.org/10.1364/AO.40.002551


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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

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(300.6390) Spectroscopy : Spectroscopy, molecular
(350.1270) Other areas of optics : Astronomy and astrophysics

Citation
Jihong Geng, Jonathan I. Lunine, and George H. Atkinson, "Absolute Intensities and Pressure-Broadening Coefficients of 2-μm CO2 Absorption Features: Intracavity Laser Spectroscopy," Appl. Opt. 40, 2551-2560 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-15-2551

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