THE STRUCTURE OF THE CRYSTALLINE TRACKS Ba2Ti Si2O8 FORMED IN GLASS BY A LASER BEAM
Optical microscopy, Raman spectroscopy and transmission electron microscopy were used to study in detail the structure of the femtosecond laser-induced crystalline tracks in the barium titanosilicate glass of 40BaO·20TiO2·40SiO2 (mol.%) composition. The presence of crystalline blocks of fresnoite Ba2TiSi2O8 in the structure of laser-written tracks is demonstrated. It is shown that the use of anamorphic prism pairs reduces the defectiveness of structure of the crystalline tracks. Obtaining high-quality crystalline tracks consisting of nonlinear optical fresnoite phase is perspective in terms of development of active waveguide elements for integrated optics