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 $mu@m and the kinetics of color centers decay allows us to draw a conclusion about heat character of observed changes.
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机译：研究了$ TAU @ $ PHI脱脂硅酸盐玻璃（类似于SCHOTT目录的SF玻璃的折射率的折射率变化的机制，并在高功率激光辐射与量子能量较少的带隙下进行了研究。结果表明，激光诱导的颜色中心导致在激光脉冲作用期间将折射率的折射率增加到暴露的体积中。即使在光学元件厚度小于1mm的情况下，这也能够相当大地重新分布辐照度和激光辐射亮度的降低。由于通过颜色中心吸收辐射，观察到的效果可以通过辐射诱导的物质和加热的抗辐射和加热。通过激光脉冲在0.53 $ Mu @ m曝光后比较玻璃的折射率变化的动力学和颜色中心的动力学使我们能够得出观察到的变化的热特性的结论。
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