On Using Holograms for Test Glasses

Abstract

Holograms have been made of test glass surfaces and later used in place of the test glass to evaluate optics. The reconstructed virtual image of the test glass surface is superimposed on the surface of the optic to be evaluated and the resulting interference rings interpreted with regard to power error and irregularity. This paper describes the technique used to produce and employ such holograms for both positive and negative surfaces.