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Glasses and glass ceramics doped with transition metal ions are widely used as optical elements of laser devices. Transparent (monocrystalline, glassy, glass-crystalline) materials with cobalt ions are used as a Q-switch of IR lasers generating nanosecond pulses in the range of 1.3 - 1.7 μm. =We obtained initial transparent glasses of the composition (70-x)ZnO-10SiO2-(20+x)B2O3 (x = 0; 5; 10) wt. %, doped with cobalt (0,00; 0,05; 0,20; 0,40 wt.% CoO). These glasses were prepared by melting and quenching technique at a temperature of 1150 °С in corundum crucibles.