Glass composition having a phonon spectrum of low-energy, their use and process for their preparation

摘要

(57) their preparation, as well as a summary of the present invention, preparation of transparent glass thin layer and production of glass compositions based Calco halide glass and rare earth metal-doped chalcogenide glass and, without or with the co-doped and its use for the optical element. One element, one element, the doping additive one element, and the glass composition contains at least sulfur and rare earth metal element of at least one halide of at least the fourth main group of at least the third main group to.