Accession Number : ADA182203

Title :   Heavy Metal Fluoride Glasses.

Descriptive Note : Final rept. 21 Dec 84-10 Feb 86,

Corporate Author : HEBREW UNIV JERUSALEM (ISRAEL)

Personal Author(s) : Reisfield,Renata ; Eyal,Marek

PDF Url : ADA182203

Report Date : Apr 1987

Pagination or Media Count : 46

Abstract : The absorption spectra of chromium and nickel at octahedrsl sites in a zirconium barium fluoride glass are analyzed and compared with vitreous and crystalline mixed oxides, suggesting slightly longer chromium fluoride and nickel fluoride distances than in crystalline fluorides. Laser properties were calculated for rare earth ions in fluoride glass. Pumping efficiencies, lifetimes of excited and terminal levels, and stimulated peak cross sections are presented. Multiphonon relaxation are shown to be orders of magnitude lower in the fluoride glass than in the tellurite glass and the ingomogeneous width is consistently smaller in fluoride glass than in tellurite glass, which was chosen as a model for oxide glass. No significant difference was found for concentration quenching between the two kinds of glasses. Energy transfer between manganese and neodymium can increase pumping efficiencies of neodymium lasers. The above results show that it is feasible to use Nd doped fluoride glasses as light sources for fluoride fibers as an integral part of the fiber. (Keywords)Fluorozirconate Glasses, Multiphonon Absorption, Laser Light Source, Energy Transfer.

Descriptors :   *ABSORPTION SPECTRA, *FLUORIDES, *GLASS, *HEAVY METALS, CHROMIUM, CRYSTALS, MIXING, OXIDES, FIBERS, FLUORINE COMPOUNDS, ZIRCONATES, LASERS, LIGHT SOURCES, ENERGY TRANSFER, LASER PUMPING, EXCITATION, EMISSION SPECTRA, ERBIUM, EUROPIUM, HOLMIUM, REFRACTIVE INDEX, FIBER REINFORCEMENT, OPTICAL GLASS, MANGANESE, PHONONS, RELAXATION, NEODYMIUM LASERS, NICKEL, EFFICIENCY, PUMPING, CROSS SECTIONS, PEAK VALUES, STIMULATION(GENERAL), VITREOUS STATE, IONS, RARE EARTH ELEMENTS, TELLURIUM COMPOUNDS, BARIUM HALIDES, ZIRCONIUM COMPOUNDS

Subject Categories : Ceramics, Refractories and Glass
      Refractory Fibers

Distribution Statement : APPROVED FOR PUBLIC RELEASE