Mass density and the Brillouin spectroscopy of aluminosilicate optical fibers

Dragic, Peter D.; Ballato, John; Ballato, A.; Morris, Stephanie; Hawkins, Thomas; Law, Pi Cheng; Ghosh, Sumana; Paul, Mukul Chandra

doi:10.1364/ome.2.001641

Cited by 32 publications

(27 citation statements)

References 36 publications

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“… leads to a nonlinear refractive index of 1.84 × 10 −13 esu (4.64 × 10 −20 m 2 /W at 958 nm); within roughly 3% of the value obtained from the fiber measurements. This very reasonable agreement further suggests that many of the observed properties of alumina are driven mainly by its in situ apparent mass density . The slightly higher refractive index from the Ref.…”

Section: Resultssupporting

confidence: 66%

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The linear and nonlinear refractive index of amorphous Al₂O₃ deduced from aluminosilicate optical fibers

Dragic

Cavillon

Ballato

2017

Int J of Appl Glass Sci

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The Sellmeier coefficients for the linear refractive index of amorphous alumina (a-Al 2 O 3 ) are deduced from measurements on binary aluminosilicate glass optical fibers. This data is then used to approximate the nonlinear refractive index, n 2 , for a-Al 2 O 3, which was found to be 1.89 9 10 À13 esu (4.77 9 10 À20 m 2 /W at a wavelength of 958 nm) and found to increase slightly sublinearly with increasing alumina concentration in silica glass. Several commonalities with some amorphous alumina thin films are suggested. In addition, a proposal for the extension of a simple additive materials model for the calculation of n 2 as a function of composition is presented. Alumina is an important dopant into silica for high energy optical fiber-based lasers and so the determination and modeling of its optical properties is of significant technological value. K E Y W O R D Saluminosilicate glass, glass products, modeling, nonlinear refractive index, optical fibers, optical properties, properties, refractive index

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Section: Resultssupporting

confidence: 66%

“…The slightly higher refractive index from the Ref. data suggests the density of the thin film is slightly higher than that encountered in the aluminosilicate glass found in the optical fiber, but density can vary somewhat in both cases for a number of reasons.…”

Section: Resultsmentioning

confidence: 86%

The linear and nonlinear refractive index of amorphous Al₂O₃ deduced from aluminosilicate optical fibers

Dragic

Cavillon

Ballato

2017

Int J of Appl Glass Sci

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“…The 4 mol% glass is clearly separated from the 18 and 24 mol% glasses, which are separated from the 29 mol% glass, which is separated from the 41 mol% glasses. This is consistent with the observed effect of adding alumina to silica glass on acoustic velocity . It may also imply less Brillouin scattering with increased Al 2 O 3 in the glasses, as evidenced in the experimental data from the Molten Core glasses.…”

Section: Resultssupporting

confidence: 89%

“…Incorporation of alumina into silica has been shown to increase the acoustic velocity . Since Brillouin scattering is affected by vibrations and phonon transport, altering polarizability, thermal excitement of atoms in a section of the glasses was used to evaluate transport of this energy via thermal transport through the glass.…”

Section: Resultsmentioning

confidence: 99%

Molecular simulations of the structure and thermal transport of high alumina aluminosilicate molten core glass fiber

Greenberg

Garofalini

2018

J Am Ceram Soc

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The atomistic structure and phonon transport in aluminosilicate glasses made via an interfacial mixing model of the Molten Core process were studied using molecular dynamics simulations. In the simulations, silica glass was brought in contact with different size alumina crystals (to afford core glasses with 4, 18, 24, 29, and 41 mole% alumina concentrations), followed by a melt‐quench process to enable mixing of the phases. The atomistic structure of the resulting glasses and radius of gyration calculations of resultant Al‐O‐Al connected clusters were evaluated. Variation in the 1‐dimensional thermal transport in each glass was also determined and showed that increased alumina concentration in the glasses resulted in increased transport of thermal energy. Results of the structural analyses showed a double peak in the Al‐Al pair distribution function, with the short‐distance peak indicative of edge‐sharing Al‐O‐Al‐O bonding and a longer distance peak of Al‐O‐Al bonding that is not indicative of edge‐sharing structures. The ratio of the first Al‐Al peak to the second Al‐Al peak varied inversely with the thermal transport behavior. An increased radius of gyration of Al‐O‐Al connectivity occurred with increasing alumina concentration, providing a mechanism for the increased thermal transport. Nanosegregation was also observed. Interconnectivity between Al ions created isolated Al‐O‐Al bonded clusters at low alumina concentrations with lower thermal transport than the high alumina glasses, whereas the latter showed a percolated network of Al‐O‐Al bonds that increased thermal transport.

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“…However, typical strategies for compositional design remain empirical due to the lack of understanding regarding the structural role of alumina on intermediate length scale. On the other hand, high dopant capacity allows for shorter fiber lengths and/or significantly higher power levels 14 . We now explore the low-frequency modes of binary aluminosilicate glasses through analysis of low temperature heat capacity and low frequency Raman scattering so as to find quantitative scaling parameters and, subsequently, relations between chemical composition, intermediate-range order and the length-scale of elastic heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses

Ando¹,

Benzine²,

Pan³

et al. 2018

Sci Rep

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In binary aluminosilicate liquids and glasses, heterogeneity on intermediate length scale is a crucial factor for optical fiber performance, determining the lower limit of optical attenuation and Rayleigh scattering, but also clustering and precipitation of optically active dopants, for example, in the fabrication of high-power laser gain media. Here, we consider the low-frequency vibrational modes of such materials for assessing structural heterogeneity on molecular scale. We determine the vibrational density of states VDoS g(ω) using low-temperature heat capacity data. From correlation with low-frequency Raman spectroscopy, we obtain the Raman coupling coefficient. Both experiments allow for the extraction of the average dynamic correlation length as a function of alumina content. We find that this value decreases from about 3.9 nm to 3.3 nm when mildly increasing the alumina content from zero (vitreous silica) to 7 mol%. At the same time, the average inter-particle distance increases slightly due to the presence of oxygen tricluster species. In accordance with Loewensteinian dynamics, this proves that mild alumina doping increases structural homogeneity on molecular scale.

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Mass density and the Brillouin spectroscopy of aluminosilicate optical fibers

Cited by 32 publications

References 36 publications

The linear and nonlinear refractive index of amorphous Al₂O₃ deduced from aluminosilicate optical fibers

The linear and nonlinear refractive index of amorphous Al₂O₃ deduced from aluminosilicate optical fibers

Molecular simulations of the structure and thermal transport of high alumina aluminosilicate molten core glass fiber

Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses

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Mass density and the Brillouin spectroscopy of aluminosilicate optical fibers

Cited by 32 publications

References 36 publications

The linear and nonlinear refractive index of amorphous Al2O3 deduced from aluminosilicate optical fibers

The linear and nonlinear refractive index of amorphous Al2O3 deduced from aluminosilicate optical fibers

Molecular simulations of the structure and thermal transport of high alumina aluminosilicate molten core glass fiber

Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses

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The linear and nonlinear refractive index of amorphous Al₂O₃ deduced from aluminosilicate optical fibers

The linear and nonlinear refractive index of amorphous Al₂O₃ deduced from aluminosilicate optical fibers