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23 September 2005 Optical losses of multi component glasses for fibers and methods of their reduction
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Minimization of Rayleigh scattering, αs, and absorption, αabs, losses in glasses for fiber drawing is considered in the study. Glasses were studied with high temperature (to 1500°C) ultrasonic acoustics, Rayleigh and Mandel'shtam-Brillouin scattering, Raman scattering (RS) and absorption spectroscopy. Contributions into αs from "frozen-in" density and concentration fluctuations were separated. The αs (multi component glass) < αs (silica glass) relationship is realized in glasses built from structural units of a single type found from RS and characterized by low glass transition temperature. Chemical inhomogeneities can be made optically invisible by means of prompt choice of glass composition. Selective entering of multi electron ions into concentration fluctuations of glass melt (doped ion segregation) causes excessive Rayleigh scattering by glass. To shift minimum αabs of low scattering glass to longer wavelengths it is necessary to dope it by randomly distributed heavy metal ions or components decreasing modifier cation-anion bond strength of a glass network.
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Leonid V. Maksimov, Anatoli V. Anan'ev, Viktor N. Bogdanov, Tatiana S. Markova, Sergei N. Smerdin, and Oleg V. Yanush "Optical losses of multi component glasses for fibers and methods of their reduction", Proc. SPIE 5951, Optical Fibers: Technology, 59510E (23 September 2005);


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