Factors affecting optical dispersion in borate glass systems

Manal Abdel-Baki, F. A. Abdel-Wahab, Amr Radi, Fouad El-Diasty

Research output: Contribution to journalReview article

108 Citations (Scopus)

Abstract

Series of ternary glass systems namely, Na2 O, B2 O3, and RO (R = Ba or Mg) doped with TiO2 are synthesized. The present glasses are dictated by requirement for a small refractive index and a small nonlinear coefficient needed for waveguide and laser fabrication requirements. The effect of MgO and BaO as alkaline earth metals on the optical properties of the glass systems is investigated. The dependence of the refractive index and extinction coefficient dispersion curves on composition is carried out over a wavelength range of 0.3-2.5 μ m. Applying a genetic algorithm technique, the parameters of Sellmeier dispersion formula that fit index data to accuracy consistent well with the measurements are given. The zero material dispersion-wavelength (ZMDW) and group velocity are also determined using the refractive index data. The Fermi level is calculated exploiting the extinction coefficient dispersion curves. The absorption coefficient, both direct and indirect optical energy gaps, and Urbach energy are evaluated using the absorption edge calculations. The different factors that play a role for controlling the refractive indices such as coordination number, electronic polarizability, field strength of cations, bridging and nonbridging oxygen, and optical basicity are discussed in accordance with the obtained index data. IR spectroscopy is used as a structural probe of the nearest-neighbor environment in the glass network.

Original languageEnglish
Pages (from-to)1457-1470
Number of pages14
JournalJournal of Physics and Chemistry of Solids
Volume68
Issue number8
DOIs
Publication statusPublished - Aug 2007

Fingerprint

Borates
borates
Refractive index
refractivity
Glass
glass
extinction
coefficients
Alkaline Earth Metals
Alkaline earth metals
Wavelength
requirements
alkaline earth metals
curves
Alkalinity
Fermi level
coordination number
group velocity
wavelengths
genetic algorithms

Keywords

  • A. Oxide glasses
  • D. Optical properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Factors affecting optical dispersion in borate glass systems. / Abdel-Baki, Manal; Abdel-Wahab, F. A.; Radi, Amr; El-Diasty, Fouad.

In: Journal of Physics and Chemistry of Solids, Vol. 68, No. 8, 08.2007, p. 1457-1470.

Research output: Contribution to journalReview article

Abdel-Baki, Manal ; Abdel-Wahab, F. A. ; Radi, Amr ; El-Diasty, Fouad. / Factors affecting optical dispersion in borate glass systems. In: Journal of Physics and Chemistry of Solids. 2007 ; Vol. 68, No. 8. pp. 1457-1470.
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