The absorption cross section of CF<sub>2</sub>Cl<sub>2</sub> has been measured as a function of presure and CO<sub>2</sub> laser input power at 10.764 μm. The laser was operated in the continuous wave mode providing a continuous energy deposition in the sample. It is shown that the absorption cross section measured has a strong dependence on input power density in the range from 5 to 15 W/cm<sup>2</sup> and pressure in the 3 to 50 Torr regime. It is demonstrated that most of these effects can be attributed to the temperature rise in the beam interaction volume.
Peter M. Castle, "Laser Power Density Dependence in Absorption Measurements," Appl. Spectrosc. 34, 311-313 (1980)