The aim of this work is to develop efficient saturated absorbers based on magnesium aluminosilicate glass-ceramic materials for lasers based on Yb-Er glass. The system was chosen and the mechanism of phase formation was studied. Transparent sitals based on spinel nanocrystals doped with Co 2+ ions and modified with ZnO, P2O5 CeO2, and B2O3 were obtained.Кеуwordsmagnesium aluminum silicate glass, spinel nanocrystals, Q-factor modulation, passive gates.