Red, green and violet up-conversion in erbium doped telluride glasses

In this work we present the results of our recent studies on up-conversion phenomena in erbium doped telluride glasses (with chemical composition 78TeO₂-11ZnO-11Na₂O, abbreviated TZN). The set of five erbium doped bulk samples of concentrations ranging from 1000 to ca. 40000 ppm, has been carefully investigated by means of highly-resolved laser spectroscopy, with specific attention focused on analysis of up-conversion processes resulting in short-wavelength emission under infrared (808 nm, 980 nm, 1480 nm) and red (657 nm) pumping by commercially available semiconductor lasers diodes.