酸化イットリウム焼結体の屈折率と反射率

抄録

The Refractive and reflective indeces of Y₂O₃ sintered pieces were measured. The Y₂O₃ specimens are transparent and have a 100% relative density. A tungsten lamp, sodium discharge lamp or He. Ne laser was used as the sources of light for measuring the refractive indeces. The light from these sources in the wavelength range of 0.44-0.67 μ m was polarized with a Polaroid HN-38 polarizer to obtain Brewster's angle θ. The refractive indeces were calculated from the tan θ equation. A Hitachi infrared spectrophotometer, type 215, was used to measure the reflective indeces of Y₂O₃ specimens. A glass plate with a deposited Al layer on its face was used as the reference material with a 100% reflective index. The N_D of the Y₂O₃ specimens was 1.910 ± 0.006. Furthermore, the relation between refractive index n and wavelength λ (μ m) was given by Cauchy's equation as follows: 9.33 x10^-3 n=1.884+ λ 2 The reflective indeces of Y₂O₃ specimens were 10% between 2.5-8 μ m. The indeces of the specimens, however, decrease at wavelength of more than 8 μ m and reached 3.3% at 13 μ m.