Mach-Zehnder Interferometer Investigations on Some Laser Dye Solvents |
| R. Ghazy Laser Lab., Phys. Dept., Faculty of Sciences, Tanta University, Tanta, Egypt |
| Received: April 8, 1998; revised version October 16, 1998; in final form February 18, 1999 |
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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 5.8×10-4. 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 (nm) of these mixtures is plotted as a function of the investigated percentages. The temperature behavior of these refractive indices (dnm/dt) was studied carefully within a temperature range of (20-80°C). We have found that both the refractive index (nm) and temperature behavior of the refractive indices (dnm/dt) of different mixtures of the investigated solvents have the average index properties of the parent solvents. Also, a fitted empirical relation between nm, P, and t has been assumed as nm =aPbtc with empirical constants a, b, and c. According to that equation we have recalculated nm of these solvent mixtures and we have found satisfying agreement with the experimental results. |
| DOI: 10.12693/APhysPolA.95.939 PACS numbers: 42.55.Mv, 78.20.Ci |