Abstract

We point out the importance of intensity-dependent refractive-index effects when measuring transmission or absorption characteristics of gases with high-power TEA CO2 laser pulses. An example is given showing how self-focusing in low-pressure SF6 gas severely affected the transmission of a Gaussian beam. This effect increased rapidly with pressure but remained unchanged when the TEA CO2 fluence varied from 0.3 to 1.0 J/cm2.

© 1981 Optical Society of America

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