Structural response of porous glass to laser radiation under cold thermo-densification

It is reported about an attempt at local modification of the optical properties in the bulk of macroporous glass plates with a porosity of 0.58 cm ³ / cm ³ and an average channel size of 50 - 70 nm under the action of laser radiation weakly absorbed by the material. ... As a radiation source, an ytterbium fiber laser with an emission wavelength? Lambda; = 1.07 µm, pulse duration & tau; _and ~ 100 ns and their repetition rate & upsilon; = 10 - 100 kHz. The dependences of the temperature and power of radiation transmitted through the irradiated area on the duration of exposure are given.