Figure metrology of deep general aspherics using a conventional interferometer with CGH null

Steven M. Arnold; L. Curt Maxey; JoEllen Rogers; Robert C. Yoder

doi:10.1117/12.218413

8 September 1995 Figure metrology of deep general aspherics using a conventional interferometer with CGH null

Steven M. Arnold, L. Curt Maxey, JoEllen Rogers, Robert C. Yoder

Proceedings Volume 2536, Optical Manufacturing and Testing; (1995) https://doi.org/10.1117/12.218413
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Steven M. Arnold, L. Curt Maxey, JoEllen Rogers, and 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); https://doi.org/10.1117/12.218413

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