REFLECTING-REDUCING COATINGS FOR OPTICAL SURFACES

摘要

A study of the two-coat reflection-reducing film developed by Foulton and Tillyer of the American Optical Co. was made, particularly as regards the method of formation of these films and their properties. The preferred method of application was found to be the addition of portions of Solution #157c to glass disks while rotating at 4750 RPM followed by the application of Solution #50a (containing 5% butane) at 2300-2500 RPM with a 15-minute baking at 100.-105°C after each addition of solution. The films so formed were uniform, clear and hard and very efficient in reducing reflection. A typical disk of 1.525 index glass coated with this system gave a reflection of O.14%per surface of incident light of 5500 A° wave length.