Abstract

Refractive-index anisotropy and dispersion were measured in a tetragonal gehlenite (Ca₂Al₂SiO₇) single crystal between 308 and 1064 nm at room temperature. Use was made of the bireflectance effect in an oriented single-crystal prism for obtaining an accurate measurement of the anisotropy. At the wavelength λ = 632.8 nm, the ordinary and the extraordinary refractive indices n_o and n_e were n_o = 1.663 ± 0.0015 and n_e = n_o − 0.0085 ± 0.0002, respectively. The dispersion was fitted to a Sellmeier function n² = 1 + Aλ²/(λ² − B), with A_o = 1.712 ± 0.004, A_e = A_o − (25 ± 1) × 10⁻³, B_o = (1.196 ± 0.005) × 10⁻² (μm)², and B_e = (1.133 ± 0.005) × 10⁻² (μm)².

© 1993 Optical Society of America

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