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Automatic laser refractometer

For all kinds of laser applications is important to know the refractive indices of materials for the corresponding wavelength. Accurately measured RI value can be used for structural analysis, in many branches of the science and industry. However, commercial refractometers usually measure refractive index at the wavelength of one lamp's discrete line. That's why investigators sometimes have to design new or to modify standard refractometers to perform adequate experiment on the desired wavelength. This work reports the design of a simple automatic laser refractometer. The method of the disappearing diffraction pattern is used for the measurements. The device uses diode laser placed in a socket, which allows easy replacement of lasers and performing measurements at different wavelengths. The apparatus can measure RI of liquids with accuracy better than 1.10-3 in a range from 1.33 to 1.40.