Laser-induced changes of refractive index of lead-silicate glasses

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Abstract
The mechanisms of photo-induced changes of refractive index of the (Tau) (Phi) lead- silicate glasses (analogous with the SF glasses from Schott catalog) under the effect of high power laser radiation with quantum energy less bandgap have been studied. It is shown that the laser-induced color centers results in increase of refractive index into the exposed bulk during the laser pulse action. This leads to considerable redistribution of irradiance and decrease of laser radiation brightness even in the case of optical elements less 1 mm thickness. The observed effect may be connected both with radiation-induced dilation of matter and heating of interaction region owing to absorption of radiation by color centers. Comparing the kinetics of refractive index change of the glass after exposure by laser pulse at 0.53 micrometers and the kinetics of color centers decay allows us to draw a conclusion about heat character of observed changes.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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