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Considerable interest has recently been evidenced in infrared transmitting glasses for components such as laser windows, IR domes and IR optical fibers. In particular, multicomponent heavy metal fluoride glasses based on zirconium or hafnium have displayed desirable optical characteristics, viz., low refractive index, absorption and scattering losses, and a very wide spectral transparent regime, in addition to attractive mechanical and chemical properties.
This talk will review the optical properties of this and related metal halide glasses over the entire spectral range (9 μm to 260 nm). This will include review of experimental data for the ultraviolet absorption edge, infrared edge absorption and temperature dependence, and the understanding of the latter through fundamental vibrational spectra, information regarding which is obtained from a study of infrared reflection and Raman scattering measurements. Effects of nuclear radiation on the optical properties of a number of these glasses will be presented.
infrared windows, metal-Fluoride glasses, radiation damage, Raman scattering
University of Rhode Island, Kingston, RI