INVESTIGATION OF OPTICAL SURFACES OF PLANE-CONVEX LENSES USING AN EXPERIMENTAL INTERFERENCE SETUP WITH A DIFFRACTED REFERENCE WAVEFRONT

The paper describes a layout of an experimental interferometric setup, the operation of which is based on the formation of a reference wavefront using a pinhole diaphragm. Optical devices and complexes built according to this scheme enable the carrying out of measurements on the surfaces of optical parts and elements intended for high-precision optics (interferometers for various purposes, interference microscopes, etc.), therefore, the work is promising and relevant. The paper presents an optical layout of the interferometer, as well as technical and operational characteristics of the experimental setup. The objects and the method of research are stated. Interferograms were obtained from the surfaces of plane-convex lenses made of K8 colorless optical glass, КИ quartz glass (fused quartz SiO2), and zinc selenide (ZnSe). The images of interference fields were analyzed, and the main parameters of wavefronts were revealed. Optical surfaces were controlled using an experimental setup with an accuracy of not worse than 0.01 λ. The reflectivity of the optical surfaces of the provided samples was investigated, and the dependences of the reflection coefficient along the x and y coordinates were obtained.