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25 September 2008 Interferometrical testing of parabolic mirrors with diffracted spherical wavefront
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lin Li "Interferometrical testing of parabolic mirrors with diffracted spherical wavefront", Proc. SPIE 7102, Optical Fabrication, Testing, and Metrology III, 71020X (25 September 2008);

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