Abstract

The absorption of radiation from a cw CO₂ laser by a mixture of absorbing SF₆ and transparent buffer gases has been measured as a function of pressure of added transparent gas (C₄H₁₀). The results are analyzed in terms of thermal diffusion of excited SF₆ molecules out of the irradiation zone. In the 60–400-Torr pressure range, thermal difusion depletes the concentration of SF₆ so that the overall absorption is decreased and competes with the various channels of collisional relaxation which enhance absorption. An approximate semiempirical expression is used to determine the transient perturbation of concentration which occurs inside the laser beam.

© 1982 Optical Society of America

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