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

Peter Dragic, Maxime Cavillon, John Ballato

Research output: Contribution to journalArticlepeer-review


The Sellmeier coefficients for the linear refractive index of amorphous alumina (a-Al2O3) are deduced from measurements on binary aluminosilicate glass optical fibers. This data is then used to approximate the nonlinear refractive index, n2, for a-Al2O3, which was found to be 1.89 × 10−13 esu (4.77 × 10−20 m2/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 n2 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.

Original languageEnglish (US)
Pages (from-to)421-427
Number of pages7
JournalInternational Journal of Applied Glass Science
Issue number3
StatePublished - Jul 2018


  • aluminosilicate glass
  • glass products
  • modeling
  • nonlinear refractive index
  • optical fibers
  • optical properties
  • properties
  • refractive index

ASJC Scopus subject areas

  • Materials Science(all)

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