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We have used a laser interferometric method to determine the refractive index of some laser dye solvents with a high accuracy of 5.8 x 10(-4). The determination of refractive index (n) has been done by counting the interference fringes (N) as a function of the incidence angle of the laser beam. The absolute refractive index of pure water, dimethylsulfoxide, and different mixtures of percentages (P) 25%, 50%, 75% of dimethylsulfoxide has been measured. The relation between the bulk refractive index (n(m)) of these mixtures is plotted as a function of the investigated percentages. The temperature behavior of these refractive indices (dn(m)/dt) was studied carefully within a temperature range of (20-80 degrees C). We have found that both the refractive index (n(m)) and temperature behavior of the refractive indices (dn(m)/dt) of different mixtures of the investigated solvents have the average index properties of the parent solvents. Also, a fitted. empirical relation between n(m), P, and t has been assumed as n(m) = aP(b)t(c) with empirical constants a, b, and c. According to that equation we have recalculated n(m) of these solvent mixtures and we have found satisfying agreement mi-th the experimental results.

Mach-Zehnder Interferometer Investigations on Some Laser Dye Solvents