New high-temperature measurements of collisional linewidths of the Raman Q branch of nitrogen have been performed at 1700–2400 K with stimulated Raman spectroscopy in a tungsten filament. We fitted these data together with previous data obtained in the 295–1500-K range to redetermine the parameters of the relaxation models used in coherent anti-Stokes Raman spectroscopy thermometry. The improvement in the accuracy of the temperature measurement has been checked. Semiclassical calculations of linewidths in the 1700–2400-K range agree with the experimental data and have been extended to even higher temperatures.
© 1995 Optical Society of America
Original Manuscript: November 23, 1994
Published: May 15, 1995
B. Lavorel, J. Bonamy, D. Robert, and L. Guillot, "Collisional Raman linewidths of nitrogen at high temperature (1700–2400 K)," Opt. Lett. 20, 1189-1191 (1995)