Аннотация:Lead fluoroborate and fluorosilicate glasses codoped with Nd 3+ /La 3+ , Er 3+ /Lu 3+ and Er 3+ /Yb 3+ /Lu 3+ - have been synthesized. Glass-ceramics have been made by heattreatment. In a glass-ceramic the rare-earth ions were located in fluoride crystal nanoparticles distributed in a glass. The changes in structural, mechanical and optical properties of the glassceramics were revealed in comparison with the initial glasses.