Formation of modified areas of porous glass saturated with glycerin under the action of laser radiation

The formation of modified areas with changed optical properties in the volume of thin plates of porous glass (composition of 94.73SiO₂ · 4.97B₂O₃ · 0.30Na₂O), saturated with glycerin—a substance with a high polarization capacity, under the action of laser radiation was investigated. A continuous wave ytterbium fiber laser with radiation wavelength λ = 1.07 μm weakly absorbed by porous glass was used as the radiation source. When the radiation power was within the range of 9.6–16.5 W and the irradiation time was 270–300 s, optical-grade modified areas were obtained. During the experiment, the dependences of temperature in the spots of the impact and of the power of the radiation transmitted through a thin plate of porous glass, on irradiation time were registered.