Automatic refractometer for measuring refractive indices of solid material over a wild range of wavelengths

摘要

A description is given of a refractometer on which refractive indices of solid materials have been measured from 0.4 mu m to 12 mu m. The computer controls the procedure of measurement and automatic measuring is achieved. Infrared light, visual light and grating monochromatic provide the system with continual monochromatic wave. Different detector and different method of measurement are used at differnet range of wavelengths. Oscillating slit technique is used to improve measuring accuracy. Refractive index values are obtained with an estiamte uncertainty of 5 x 10~-6 in visual waveband and 2 x 10~-4 in infrared waveband. Values of refractive indices for germanium are given in the end.