||Special glasses and fibres for infrared applications
Dimitrij Ležal, DSc.
The project was concerned with the preparation of special glass systems, characterized by low phonon energy, and with drawing of
optical fibres that effectively transmit radiation in the infrared spectral range. The work was concentrated on the preparation
of chalcogenide and heavy metal oxide glasses characterized by high chemical purity and low concentration of defects and doping
of these systems by rare-earths elements. The core of the project was aimed to improve our understanding of glass-constitution
and of physical properties of chalcogenide and particularly oxihalide glasses in the systems TeO2
Important research focus has been the search for suitable combination of host-glass and rare earth doping element. The major goal
was to optimize the procedure of synthesis of homogeneous glasses, their characterization and investigation of optical properties.
Homogeneous glass samples were used to measure transmission in the visible and infrared region of spectra, reflection spectra,
particularly for low wave numbers, in order to understand vibrations of inter-atomic bonds that determine the glass network.
Samples were further characterised in detail by low-temperature photoluminescence and Raman spectroscopy. Special attention
has been devoted to the drawing of fibers from prepared performs and their characterisation.