Broadening coefficients for the P(20) CO2 laser transition

Accurate line-shape and linewidth measurements have been made on the P(20) 10.6-μm CO2 laser transition using optoacoustic spectroscopy and a tunable waveguide CO2 laser. The absorption line shape is shown to be accurately represented by a Voigt line shape and the measured broadening coefficients are γCO2=7.61±0.10, γN2=5.58±0.20, and γHe=4.88±0.18 MHz/Torr, all measured at 298°K.