Three-wavelength laser microrefractometer

A three-wavelength laser microrefractometer has been assembled and standard liquids have been used for calibration of the experimental set-up. Refractive indices of polymer solutions of Polycarbonate, Polyarylate, Polyester, Nylon, Copolyester A and Copolyesters B are measured. Experimental results of the examined samples are obtained at laser wavelengths of 532 nm, 632.8 nm and 790 nm. A standard uncertainty of +/- 2x10(-4) has been achieved applying gomiometric table with 1-arcmin resolution. Specific refraction of the investigated polymer materials and their solutions are determined. The dispersion coefficients of Sellmeier's and Cauchy's equation are calculated and comparative dispersion curves are illustrated.