Abstract:A novel null corrector design for use with a white light scatterplate interferometer on a large conic surface is presented. In this design, an aspheric diamond-turned mirror (DTM), hereafter called the nullcorrecting mirror (NCM), exactly cancels out the spherical aberration of the mirror under test. Low-power refractive elements correct field aberrations over the finite aperture of the scatterplate. The null corrector maintains a phase difference between the test and reference beams of less than 1 2 wave over… Show more
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