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We present a design and new approach to certify a null corrector with tight manufacturing tolerances. This involves a diamond turned asphere and a hologram that provide certification redundancy.
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Jose M. Sasian, Scott A. Lerner, James H. Burge, Hubert M. Martin, "Design, tolerancing, and certification of a null corrector to test 8.4-m mirrors," Proc. SPIE 3739, Optical Fabrication and Testing, (6 September 1999); https://doi.org/10.1117/12.360175