METHOD OF LOCAL NANOCRYSTALLIZATION OF BARIUM-TITANIUM-SILICATE GLASSES Russian patent published in 2018 - IPC C03B32/02 C03C3/78 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: composition glass BaO is 35-45 moll. %, TiO₂ 10-20 moll. %, SiO₂ 40-50 moll. % is irradiated with a focused femtosecond laser beam generating pulses at a wavelength of 1030 nm with a frequency of 100-500 kHz with a duration of 300 fs and an energy of 0.5-1.5 mcJ. The laser beam focused by a lens with a numerical aperture of 0.45-0.65, is moved relative to the glass in a velocity range of 500-1000 mcm/s.

EFFECT: invention makes it possible to locally form extended nanocrystalline structures with a length of, at least, 200 mcm and an adjustable width that have the second harmonic generation in the volume of barium-titanosilicate glasses.

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