A tunable 1.7-μm cw F2+-center laser spectrometer system that is continuously tunable from 1.43 to 1.78 μm in wavelength and has a spectral linewidth (FWHM) of 0.07 cm−1 is developed. This system is used to measure the 2–0 rotational-vibrational absorption line profiles of hydrogen chloride (HCl) at high temperatures, the Boltzmann thermal equilibrium temperature, and to determine the extent of potential interference or overlap of the HCl lines with those that are due to hot water vapor. As a demonstration of the utility of the laser spectrometer system, it is also used to measure the spectra of methane (CH4) and ethylene (C2H4) near 1.65 μm, and is routed through a fiber-optic cable to a remote site to detect a CH4 plume.
© 1993 Optical Society of America
Original Manuscript: July 2, 1992
Published: February 20, 1993
Mohan Vaidyanathan and Dennis K. Killinger, "Tunable 1.7-μm laser spectrometer for optical absorption measurements of CH4, C2H4, and high-temperature HCl," Appl. Opt. 32, 847-856 (1993)