Abstract

Two single-mode diode lasers were used to record high-resolution absorption spectra of NO₂ (dilute in Ar) near 670.2 and 394.5 nm over a range of temperatures (296 to 774 K) and total pressures (2.4 × 10⁻² to 1 atm). A commercial InGaAsP laser was tuned 1.3 cm⁻¹ at a repetition rate of 1 kHz to record the absorption spectra near 670.2 nm. In separate experiments with a prototype system, an external-cavity GaAlAs laser was frequency doubled with a quasi-phase-matched LiNbO₃ waveguide and tuned 3.5 cm⁻¹ to record absorption spectra near 394.5 nm. Variations of the spectral absorption coefficients with temperature and pressure were determined from measured spectra.

© 1996 Optical Society of America

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