The regions in the volume of lanthanum-oborogermanate glass, modified by a femtosecond laser beam, have been investigated by optical microscopy and confocal Raman spectroscopy. The data obtained show that, at the stages preceding the formation of the LaBGeO 5 microcrystal, germanium nanocrystals are precipitated in the local heating zone when exposed to a femtosecond beam in a certain range of laser pulse energy. The correlation between the conditions of laser irradiation, leading to the appearance of germanium nanocrystals and the conditions with a high probability of ensuring the crystallization of the phases of the low-temperature modification of lanthanum borate and stillwellite-like lanthanum borogermanate, suggest that germanium nanocrystals can serve as nuclei for heterogeneous crystallization of LaBO 3 and LaBGeO 5
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