Refractive Properties of Barium Fluoride*

摘要: Refractive properties of barium fluoride are discussed. The refractive index, n, was determined at 25°C for 46 measured wavelengths from 0.2652 μ in the ultraviolet to 10.346 infrared. dispersion equation n2−1=0.643356λ2λ2−(0.057789)2+0.506762λ2λ2−(0.10968)2+3.8261λ2λ2−(46.3864)2,where λ is expressed microns found fit values with an average absolute residual 1.91×10−5. A tentative thermal coefficient index dn/dt spectral range −12×10−6/°C Dispersive quantities which indicate expected relative dispersion, chromatic aberration, and effect on resolution graphically presented. review transmittance data literature also