8 September 1995 Figure metrology of deep general aspherics using a conventional interferometer with CGH null
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Abstract
We present a simple and general method of aspheric figure metrology using a CGH null mounted in the test beam of a conventional Fizeau or Twyman-Green interferometer. A 'standard' reflective CGH is used to establish optical alignment with respect to the interferometer's spherical test beam. This alignment is then mechanically trnaferred to a custom CGH null. The accuaracy of the alignment transfer is readily verified. The test method has been modeled by raytracing and verified experimentally by testing a perforated 8 inch F/1.5 on-axis paraboloid and a 50 mm off-axis paraboloid from their centers of curvature.
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Steven M. Arnold, L. Curt Maxey, JoEllen Rogers, Robert C. Yoder, "Figure metrology of deep general aspherics using a conventional interferometer with CGH null", Proc. SPIE 2536, Optical Manufacturing and Testing, (8 September 1995); doi: 10.1117/12.218413; https://doi.org/10.1117/12.218413
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