An automatic spectrorefractometer for solids and liquids from the near-UV to the near-IR

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Abstract
A prototype servo-controlled spectrorefractometer has been designed and hand made to measure the refractive indices of solids and liquids with a Littrow spectrometer arrangement. The scanning spectral measurements are made at 0.5 nm steps for silica glass and water in the wavelength region from 350.0 to 1000.0 nm. The refraction spectrum of each sample exhibits numerous fine anomalous dispersions due to weak absorptions hitherto not apparent. To confirm such fine anomalous dispersions distinctly, repeated measurements are partly made. The accuracies of refractive index measurements obtained at room temperature are considered unlikely to exceed +or-7.3+or-10-5 for silica glass and +or-2.5+or-10-4 for distilled water.