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Grazing incidence interferometry has been applied to rough planar andcylindrical surfaces. As suitable beam splitters diffractive optical phaseelements are quite common because these allow for the same test sensitivity forall surface points. But a rotational-symmetric convex aspheric has twocurvatures which reduces the measurable region to a meridian through the vortexof the aspheric, which is in contrast to cylindrical surfaces having aone-dimensional curvature which allows the test of the whole surface in gracingincidence. The meridional limitation for rotational-symmetric asphericsnevertheless offers the possibility to measure single meridians in a one-stepmeasurement. An extension to the complete surface can be obtained by rotatingthe aspheric around its vortex within the frame of the test interferometer.

Grazing incidence interferometry for rough convex aspherics