The project is oriented on special glasses and glasses doped by are-earthelements for applications in optoelectronics, fiber optics and non-linearoptics. In case of chalcogenide glasses and heavy metal oxide glasses , we will investigate relations between their composition and preparation technology , glasses structure and their physical properties, which determine the suitability of glasses for practical applications too. The modeling of studied processes, structural or electronic defects, and optical centers will be added. We will develop methods how to use our physical measurements for determination of basic characteristics of glasses (thermal, chemical stability, occurrence of crystalline phases, phase separation, bulk homogenity etc.).