Abstract

High-resolution infrared diode laser spectroscopy has been used to determine line strengths, foreign-, and self-broadening coefficients for several transitions in the <i>v</i>₂ band of H₂O near 6 μm. Sources of systematic experimental error, most notably stray radiation from off-axis modes and thermal etalon effects, were detected and characterized. Their effects on the resulting line parameters were minimized by making appropriate corrections or adjusting experimental conditions such as laser current and temperature. Measured line strengths are found to agree to better than 5% with one published tabulation. Foreign-gas broadening coefficients compare favorably with theoretical values, whereas measured self-broadening coefficients were found to be systematically less.

Tunable diode laser measurements of formaldehyde foreign-gas broadening parameters and line strengths in the 9–11 μm region

Shachar Nadler, Stephen J. Daunt, and Dennis C. Reuter
Appl. Opt. 26(9) 1641-1646 (1987)

Absorption measurements of water-vapor concentration, temperature, and line-shape parameters using a tunable InGaAsP diode laser

M. P. Arroyo and R. K. Hanson
Appl. Opt. 32(30) 6104-6116 (1993)

High-resolution spectral measurement of the HNO₃ 5.9-μm band using a tunable diode laser

Clayton H. Bair and Philip Brockman
Appl. Opt. 18(24) 4152-4162 (1979)

High resolution spectral measurement of the HNO₃ 11.3-μm band using tunable diode lasers

Philip Brockman, Clayton H. Bair, and Frank Allario
Appl. Opt. 17(1) 91-100 (1978)

Diode-laser absorption technique for simultaneous measurements of multiple gasdynamic parameters in high-speed flows containing water vapor

M. P. Arroyo, S. Langlois, and R. K. Hanson
Appl. Opt. 33(15) 3296-3307 (1994)