title: Tunable diode-laser absorption measurements of NO(2) near 670 and 395 nm.
abstract: Two single-mode diode lasers were used to record high-resolution absorption spectra of NO(2) (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 LiNbO(3) 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.
authors.forename: R M
authors.initials: RM
authors.lastname: Mihalcea
authors.forename: D S
authors.initials: DS
authors.lastname: Baer
authors.forename: R K
authors.initials: RK
authors.lastname: Hanson