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Mechanism of Optical Losses in Low Phonon Energy Glasses for Infrared Fibers

Ziel

The project is targeted on meeting the future requirements of communication systems' designers related to creation of information transmitting and processing systems operating in mid infrared spectral range.

Its objectives include discrimination of mechanisms causing light scattering and absorption losses in low phonon energy (LPE) glasses; working out of scientific basis to produce LPE glasses with pre-designed level of microinhomogeneity; elaboration of methods to lower light scattering and absorption losses in LPE glasses; elaboration of methods to improve radiation resistance of LPE glasses; optimisation of glass compositions and design of trial LPE glasses for communication fiber drawing with zero material dispersion in near and mid infrared spectral range and light scattering losses significantly lower than those of silica glass.

Novelty of the Project lies in the usage of combined structural sensitive methods and structural models to identify sources of optical losses in glasses and elaborate trial LPE glasses for optical fiber drawing. Usage of absorption spectroscopy, Brillouin and Raman scattering spectroscopy combined with high temperature acoustic measurements will make it possible to separate contributions of various sources into light scattering and absorption losses.

The main idea of the Project lies in minimization of light scattering losses due to optical homogenization of a glass. It may be achieved by elaboration of glass built from constant stoichiometry groupings of a single type found from Raman scattering spectra or by reduction of optical manifestation of chemical microinhomogeneitites by fitting their refractive index to the index of their surrounding or/and lowering of glass transition temperature. The latter will make it possible to reduce physical microinhomogeneitites of glass.

The project is focused on glass forming systems of three types: germanate, fluorophosphate, and halide. Application of special laboratory synthesis technique will make it possible to lower absorption losses of halide glasses, doping of fluorophoshate glasses with rare earth protectors will ensure the increase in radiation resistance, and varying of germanate glass compositions will lead to glasses with high transparency in mid infrared spectral range.

Combination of conventional physical chemical techniques (viscosimetry, dilatometry, X-ray difraction, etc.) with optical, NMR, ESR spectroscopy and acoustics will make clear the relationship between glass properties ensuring the successful drawing of a fiber, glass composition and synthesis conditions. As a result, the most promising glass forming system will be chosen and trial glasses will be produced suitable for fiber drawing characterized by optical losses in near and mid infrared spectral range significantly lower than those of silica glass.

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Claude Bernard University-Lyon 1
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