Abstract
Laser-induced changes in glasslike materials may involve the expansion of gas trapped in materials that contain voids, with the resultant growth of bubbles around the voids, which serve as nucleation sites. If the trapped gas is initially frozen in out of equilibrium, this process will lead to irreversible changes in the material. This paper examines theoretically the process of laser-induced bubble growth in a glasslike material and the concomitant changes in the bulk properties of the material. It is pointed out that the theoretical treatment of this laser material interaction can be tested by measuring the gas-bubble distribution function and porosity in a sample of quartz-fiber material after laser irradiation. The foaming of the surface of the material can be measured and used to deduce the frozen-in pressure in the bubbles. 5 refs.
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