Photoelastic effect and density derivative of the refractive index in alkali halides

Kucharczyk, W.

doi:10.1016/0022-3697(89)90009-7

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…Figure 4 provides the photoelastic properties of these glasses, along with those for silica and selected commercial glasses and crystals. 10,26,27,31,41,[43][44][45] As a general trend, the oxide glasses tend to exhibit larger p 12 values than do halide crystals. Furthermore, PbO-based glasses, including the SF6 dense flint glass, possess near-zero p 44 values.…”

Section: (Classical) Rayleigh Scatteringmentioning

confidence: 92%

“…Figure provides the photoelastic properties of these glasses, along with those for silica and selected commercial glasses and crystals . As a general trend, the oxide glasses tend to exhibit larger p 12 values than do halide crystals.…”

Section: Compositional Effect On Individual Optical Nonlinearitiesmentioning

confidence: 96%

“…The data employed in Figure is either directly provided or computed from Refs. and the fractional cationic concentrations were calculated per Lines …”

Section: Compositional Effect On Individual Optical Nonlinearitiesmentioning

confidence: 99%

“…In both its spontaneous and stimulated forms, Raman scattering is reduced for glasses comprised of compounds possessing low molar volume, V m , and small bond compressibility parameters, Λ; specifically, P Raman S / V m Á K 2 . * As two points of reference: (a) in the well-studied alkali halide system, Λ decreases with both increasing cationic (Λ Li > Λ Na > Λ K > Λ Rb for a given halide) and anionic (Λ F > Λ Cl > Λ Br > Λ I for a given cation) mass [26][27][28] and (b) of greater relevance here, Λ for SiO 2 is quite small (0.1) and tends to increase with increasing modifier content. 15,29 Given the few tangible material parameters that directly influence Raman scattering and, for those factors, the scarcity of available data on their magnitude as a function of composition, Figure 2 provides a meager compilation of results from more common glass systems.…”

Section: Raman Scatteringmentioning

confidence: 99%

“…Furthermore, dramatically reduced Brillouin gain greatly raises the power threshold for the onset of SBS. Note the maximum power in the SBS case increases as the square root of the reciprocal of the BGC per Equation 27 in Ref. 52.…”

Section: Modeling Of the High-power/-energy Performancementioning

confidence: 99%

See 4 more Smart Citations

A unified materials approach to mitigating optical nonlinearities in optical fiber. III. Canonical examples and materials road map

Cavillon

Kucera

Hawkins

et al. 2017

Int J of Appl Glass Sci

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This paper, Part III in the Trilogy (Ballato, Cavillon, Dragic, 2018; Dragic, Cavillon, Ballato, et al., 2018a,b), provides a road map for the development of simple core/clad optical fibers whose enhanced performance-in particular, marked reductions in optical nonlinearities-is achieved materially and not through the more conventional present routes of geometrically complex fiber design. More specifically, the material properties that give rise to Brillouin, Raman and Rayleigh scattering, transverse mode instabilities (TMI), and n 2 -mediated nonlinear effects are compiled and results on a wide range of optical fibers are discussed with a focus on trends in performance with glass composition. Furthermore, optical power scaling estimations as well as binary and ternary property diagrams associated with Rayleigh scattering, the Brillouin gain coefficient (BGC) and the thermo-optic coefficient (dn/dT) are developed and employed to graphically represent general trends with composition along with compositional targets for a single intrinsically low nonlinearity, silica-based optical fiber that can achieve the power scaling goals of future high energy fiber laser applications. A foundational finding of this work is that the high-silica content optical fibers fabricated using conventional chemical vapor deposition methods will not suffice to meet the power scaling demands of future high-power and high-energy fiber lasers.

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Section: (Classical) Rayleigh Scatteringmentioning

confidence: 92%

Section: Compositional Effect On Individual Optical Nonlinearitiesmentioning

confidence: 96%

“…The data employed in Figure is either directly provided or computed from Refs. and the fractional cationic concentrations were calculated per Lines …”

Section: Compositional Effect On Individual Optical Nonlinearitiesmentioning

confidence: 99%

Section: Raman Scatteringmentioning

confidence: 99%

Section: Modeling Of the High-power/-energy Performancementioning

confidence: 99%

See 3 more Smart Citations

A unified materials approach to mitigating optical nonlinearities in optical fiber. III. Canonical examples and materials road map

Cavillon

Kucera

Hawkins

et al. 2017

Int J of Appl Glass Sci

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Correlation between Electronic Polarizabilities of Ions and Ratio of Their Radii in Alkali Halides

Kucharczyk

1990

Physica Status Solidi (b)

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Optical properties of ionic crystals are often described in terms of an approach based on the additivity rule. The approach assumes that the electronic polarizability assigned to each ion remains unchanged in all crystals containing this ion and that the electronic polarizability of the crystal is the sum of the polarizabilities of individual ions. If a crystal possesses the cubic symmetry, the optical susceptibility is related to polarizabilities of its constituent ions by the Clausius-Mossotti relation. The concept of additivity is very useful and there exist several sets of additive polarizabilities e. g. /1 to 3 1 . However, the additivity rule, which implies that the polarizability of a given ion remains constant in different crystals holds only in an approximate manner, even within the same crystal family. Theoretical values of electronic polarizabilities obtained employing different theoretical approaches predict also polarizabilities which change from crystal to crystal /2, 4 to 9/.The electronic polarizabilities are of great interest as related to ionic sizes (see, for example / 4 , lo/). Analogously to ionic polarizabilities, the additivity rule of ionic radii is often taken into consideration. However, as in the case of additive ionic polarizabilities one can observe the failure of this approach. Studies of X-ray determined electron density maps proved that within the alkali halides the radii change from crystal to crystal (see, for example values listed in /11/). Theoretical values of ionic radii obtained for alkali halides are also individual crystal dependent /12, 131.The aim of this note is to report the correlation between the polarizability ratio a / a where ac and aa are the polarizabilities of cation and anion, respectively, and the ratio of cation to anion radii rc/ra. It is usually assumed that the polarizability of cations is essentially unaffected by its environment while the polarizability of an anion Varies considerably as it is paired with different cations. Therefore, to derive aa it seems reasonable to subtract ac from the total molar polarizability . Recently, Johnson and Subbaswamy have computed polarizabilities of alkali halides in a local-density approximation scheme 181. The calculations have c a' ) U1. W6lczafiska 219, PL-93-005 Lodz, Poland. ') This work was carried out under Research Project CPBP 01.06,6.04

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Pressure dependence of effective ionic charges in alkali halides

Kucharczyk

1991

Journal of Physics and Chemistry of Solids

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Photoelastic effect and density derivative of the refractive index in alkali halides

Cited by 8 publications

References 33 publications

A unified materials approach to mitigating optical nonlinearities in optical fiber. III. Canonical examples and materials road map

A unified materials approach to mitigating optical nonlinearities in optical fiber. III. Canonical examples and materials road map

Correlation between Electronic Polarizabilities of Ions and Ratio of Their Radii in Alkali Halides

Pressure dependence of effective ionic charges in alkali halides

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