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Abstract 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 × 10 −13 esu (4.77 × 10 −20 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.
Dragic et al. (Fri,) studied this question.