Local crystallization in Li2O - B2O3 - GeO2 glasses under Cu-vapour laser

Experiments on the local modification of lithium borohermanate (LiBG) glass with the composition (molar fraction,%) 25Li ₂ O · middot; 25B ₂ O ₃ & middot; 50GeO ₂ by a copper vapor laser beam on the main lasing lines in the visible range (510.6 and 578.2 nm) and at the sum frequency in the UV range (271 nm). For the first time, the local surface crystallization of LiBG glass by a laser beam with the separation of crystals 2 - 15 ?m in size by local laser heating of a sample at a temperature slightly below t _g has been demonstrated. Using X-ray phase analysis and confocal Raman spectroscopy, it was shown that crystallization results in the formation of a single polar phase LiBGeO ₄ . Crystallization was achieved using both UV and visible radiation.