Abstract
Parabolic mirrors can be tested by means of diffraction-generated test beam technique. The parabolic mirror under test focuses the collimated laser beam from Fizeau digital interferometer. When a very small diffraction element is placed at the focal point, it diffracts the focused light and generates a spherical wave in the test arm. This spherical wave from the focus is reflected back to the interferometer by the parabolic mirror under test and services as a test beam. The optical path difference (OPD) between the test wavefront and a plane reference wavefront indicates the surface irregularity of the parabolic mirror in terms of interference fringes. There is no central hole in on-axis parabolic mirror testing. Experiments have been carried out to test high-precision parabolic mirror.
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