Design of low scattering and IR transparent glasses on the base of constant stoichiometry groupings concept

Mukhitdinova, I. A.; Сычева, Г. А.; Yanush, O. V.; Maksimov, L. V.; Markova, Tatiana Sergeevna

doi:10.1016/j.optmat.2006.01.024

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…In accordance to [11] T g ≤ T f , in particular, it can correspond to the viscosity 10 8 Ps [12] when diffusion practically stops. Rayleigh scattering loss coefficient can be estimated from R L-P of a glass under study using silica glass as a reference [14] where p 12 is the Pockels coefficient, λ is the wavelength of light, k is the Boltzmann constant, ρ is the density of glass. Therefore, combination of RMBS and high temperature acoustic data allows estimating of contributions R and R C into Rayleigh scattering separately [11] that opens the way to delicate controlling of glass inhomogeneity through glass composition varying or careful temperature-temporal treatment of a glass.…”

Section: Theorymentioning

confidence: 99%

Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods

Maksimov¹,

Anan’ev²,

Bogdanov

et al. 2011

IOP Conf. Ser.: Mater. Sci. Eng.

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Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods Abstract. General features of inhomogeneous structure characteristic of inorganic glasses are analyzed on the base of results of combined application of light scattering spectroscopy and high temperature acoustic methods. In the framework of the model of "freezing" equilibrium thermodynamic fluctuations of melt the glass composition dependences of Landau-Placzek ratios taken from Rayleigh and Mandel'shtam-Brillouin scattering (RMBS) spectra and high temperature acoustics data for glass melts make it possible to estimate separately the relative role of "frozen-in" density and concentration fluctuations in the intensity of Rayleigh scattering (RS) by glasses. The obtained data opens the way to elaboration of glasses of the highest chemical and/or optical homogeneity for fiber and laser optics. It was found that Rayleigh scattering is sensitive to the selective entering of doped ions into concentration fluctuations of a glass host (the so-called dopant segregation phenomenon). Thus, RMBS data allows controlling the real dopant-dopant separations in glasses that are significant for the elaboration of laser glasses. Being carefully measured, the intensities of Raman scattering spectral bands can be used for the determination of concentrations and partial properties of constant stoichiometry groups (CSG) from which some binary glass forming systems are built.Comparison of RMBS and Raman scattering data leads to the conclusion that concentration fluctuations in some binary glass forming systems can be considered as fluctuations of CSGs. The result can be used for the elaboration of EO glasses with minimized RS losses.

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Section: Theorymentioning

confidence: 99%

Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods

Maksimov¹,

Anan’ev²,

Bogdanov

et al. 2011

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Percentage of CSG can be found through proccesing of Raman scattering spectra of glasses with varyable glass former/modifier percentage ratio by Walles-Katz and Martens technique 16,17 . Concentrations of CSGs can be estimated through mass balance equation if intensitites of PSCs and their specific scattering cross-sections (or molar extinction in the case of IR absorption spectra) are known 18 . Mass balance equation for a glass including modifier, glass former, and conventional glass former is shown below: …”

Section: Constant Stoichiometry Groupingsmentioning

confidence: 99%

<title>Nanostructure of glasses: experimental evidence</title>

Maksimov¹,

Anan’ev²,

Bogdanov

et al. 2008

SPIE Proceedings

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Inorganic glass is material having nanoscaled physical and chemical inhomogeneities ad initio because glass inherits thermodynamic fluctuations of concentration, density and anisotropy of a glass forming melt. Combining light scattering and high temperature acoustics data allows to use the effect of internal immersion for designing multicomponent glasses with Rayleigh scattering losses lower than those of the silica glass. Non-random spatial distribution of dopants including rare-earth (RE) ions in a glass host (doped ion segregation) causes excessive Rayleigh scattering losses and enhancement of RE ion-ion interaction. Therefore, it opens the way to optimize operation parameters of laser and up-converting glasses by the proper choice of glass host composition. Results of Raman scattering spectra processing and characterization of electrooptical (EO) sensitivity of niobate glasses showed the existence of groups with stoichiometry of the well-known EO crystals and crystal-like orderliness (crystal motifs) in the glasses as the necessary condition of high EO sensitivity. It was found that EO sensitivity of glasses could be essentially increased by thermal treatment.

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“…Although several methods have been developed to predict the physical properties of glass, such as the traditional additive method, structural-chemical model, thermodynamic model, and molecular dynamics simulations, the lack of underlying physicochemical-based CSP relationships makes these methods can hardly predict the nonlinear-dependent spectroscopic properties of laser glasses. [4][5][6] According to the phase diagram approach, glass can be regarded as a product of mixed melts, which is composed of nearest-neighboring congruently melting compounds (CMCs) that could be found in corresponding phase diagrams. 7,8 The incongruently melting compounds will decompose during melting.…”

Section: Introductionmentioning

confidence: 99%

Predicting and optimizing the physical and spectroscopic properties of phosphate laser glasses using a phase diagram approach

et al. 2023

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Despite the significant technological applications of laser glasses, the quantitative prediction and optimization of their properties, particularly the spectroscopic properties, remain challenging. Here we address this problem by regarding the nearest‐neighboring congruently melting compounds as the “component and structural motifs” based on the phase diagram approach. The composition–structure–property (CSP) relationships of Nd3+‐doped ternary phosphate glasses are investigated. Spectroscopic properties are quantitatively predicted with an error of less than 10% compared to the experimental results. In particular, the fluorescence lifetime (τm) can be accurately calculated using the phase diagram approach, which is difficult to be predicted previously. Furthermore, the CSP databases with over 1000 compositions are established for the optimization of commercial laser glasses. This study enriches the CSP database of traditional laser glass and provides guiding significance for future research.

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Design of low scattering and IR transparent glasses on the base of constant stoichiometry groupings concept

Cited by 10 publications

References 24 publications

Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods

Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods

<title>Nanostructure of glasses: experimental evidence</title>

Predicting and optimizing the physical and spectroscopic properties of phosphate laser glasses using a phase diagram approach

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