MRF Developments and Asphere Metrology Using VON Technology

A brief overview of Asphere Stitching Interferometry ASI, Variable Optical Nulling VON, large optic polishing using Magneto-Rheological Finishing MRF, and a new aspheric surface representation are presented. ASI is a technique to measure aspheres without the use of null lenses. ASI was combined with VON to achieve fringes across an entire field. The technique was demonstrated on a 6 inch F2.2 lens. A few pictures are presented of polishing done for the NASA Spherical Primary Optical Telescope SPOT using MRF. Also, reference is given to a new method of presenting mirror shape using orthogonal polynomials.