Effect of Polishing Conditions on the Optical Properties of Zinc Selenide Surfaces

摘要

The effects of the polish time and the pressure applied to the sample on the quality of polycrystalline ZnSe surfaces prepared by mechanical polishing with fine-particle abrasives on wheels made of pitch-colophony resins are studied. The results indicate that, using 1-μm alumina as an abrasive and distilled water as an extender, the fourth surface finish class (RF Standard GOST 11141-84) with deviations from planarity less than half of an interference fringe at a sample diameter of up to 40 mm can be achieved at pressures applied to the sample from 30 to 35 kPa and polish times longer than 225 min. The material removal rate under the optimal polishing conditions is 0.03 μm/min.