Advanced Materials for Fiber Communication Systems

摘要

Fluoroaluminate glass is a material with a number of unique properties, but at present there are no studies that relate the chemical composition and luminescence properties. A number of fluoroaluminate glasses based on the composition (100 - x)MgCaSrBaYAl_2F_(14) - x-Ba (PO_3)_2, where x = (0.5-3.0) mol.% were synthesized by melting technique. The tendency of concentration dependence of hydroxyl absorption peaks reduction was explained by analysis of complex IR transmittance spectra and molecular refraction. The range of composition characterized by the absence of OH-absorption peaks around 3 μm was found. The concentration dependence of molecular refraction values on barium metaphosphate composition shows the inflection points in area at 1.0 mol.% and 2.0 mol.% of Ba(PO_3)_2. The analysis of the data obtained by Rayleigh and Mandel'shtam-Brillouin scattering (RMBS) spectroscopy determined the composition which has the minimum value of Landau-Placzek ratio (R_(L-p)). Er~(3+) doped fluoroaluminate glasses were prepared by the same technique. The near infrared luminescence spectra of glasses corresponding to the 4_I_(13/2) →~4_I_(15/2_ transition of Er~(3+) ions were observed. The mechanism of upconversion emissions Er~(3+) was discussed. Green and red emission bands at around 523, 546, and 660 nm wavelength were explained by two-photon process.