Refractive properties of magnesium fluoride.

The refractive indices of a commercially available specimen of single-crystal MgF2 were determined for both the ordinary and extraordinary rays at selected wavelengths from 0.2026 to 7.04 μm. Measurements were made by means of the minimum-deviation method on a precision spectrometer near 19°C. The experimentally determined index values for each polarization were fitted to a three-term Sellmeier-type dispersion equation of the form n2-1=∑Ajλ2(λ2-λj2), where n is the refractive index, λ is the wavelength of interest, λj is the calculated wavelength of an oscillator, and Aj is the strength of the oscillator at λj. The birefringence was computed as a function of wavelength from the calculated index values obtained for the two polarizations. The dispersion coefficients were also determined for the 0 ray and for the birefringence. The results of this study are compared with previously reported work on the refractive properties of MgF2.

[1]  V Chandrasekharan,et al.  Birefringence of sapphire, magnesium fluoride, and quartz in the vacuum ultraviolet, and retardation plates. , 1968, Applied optics.

[2]  E. T. Arakawa,et al.  Optical Properties of MgO and MgF2 in the Extreme Ultraviolet Region , 1972 .

[3]  A. Glass,et al.  Nonlinear refractive index of fluoride crystals , 1977 .

[4]  A Duncanson,et al.  Some Properties of Magnesium Fluoride crystallized from the Melt , 1958 .

[5]  A. L. Olsen,et al.  Transmittance of Single-Crystal Magnesium Fluoride and IRTRAN-1* in the 0.2- to 15-μ Range , 1963 .

[6]  N. Kreidl,et al.  Hot-Pressing Magnesium Fluoride , 1962 .

[7]  Fitting Refractive Index Data by Least Squares , 1961 .

[8]  High-Intensity Limit of Thomson Scattering , 1963 .

[9]  V Chandrasekharan,et al.  Anomalous dispersion of birefringence of sapphire and magnesium fluoride in the vacuum ultraviolet. , 1969, Applied optics.

[10]  F. W. Rosberry.  The measurement of homogeneity of optical materials in the visible and near infrared. , 1966, Applied Optics.

[11]  W. Johnson,et al.  Magnesium Fluoride Polarizing Prism for the Vacuum Ultraviolet , 1964 .

[12]  M. Herzberger,et al.  Refractive Indices of Infrared Optical Materials and Color Correction of Infrared Lenses , 1962 .

[13]  W. Johnson,et al.  Fluorocarbons as solvents for the vacuum ultraviolet. , 1971, Applied optics.

[14]  W. Rodney,et al.  Refractive index of cesium bromide for ultraviolet, visible, and infrared wavelengths , 1953 .

[15]  F. Forbes,et al.  A polarizer for the vacuum ultraviolet. , 1967, Applied optics.

[16]  D. Heath,et al.  Effects of a simulated high-energy space environment on the ultraviolet transmittance of optical materials between 1050 A and 3000 A. , 1966, Applied optics.