Abstract
Materials characterization for optical device purposes relies heavily upon a knowledge of material compliances related to dielectric response. This paper applies the bond orbital theory of dielectric response, developed earlier for high symmetry pretransition metal halides and chalcogenides, to the alkaline earth halides, thereby testing its validity in a wider context embracing systems with both high and low local anionic symmetry. After verifying that the primary finding of the theory remains quantitative for linear response in the more general context, nonlinear response (in the form of nonlinear refractive index n 2) is calculated and tabulated for the complete series of alkaline earth halides and for LaF 3.
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