19 August 1996 Test procedures for severely aspheric optics
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Severely aspheric lenses have surfaces which depart from spherical by millimeters rather than microns. Optical testing of these lenses can be achieved using aspheric null mirrors. Although such mirrors can give full null compensation at diffraction limited precision most severely aspheric lenses are made by molding for applications which allow many fringes of form error. Diamond turned aspheric null mirrors verified by Form Taysurf methods give a test lens plus mirror systems which can be tested using either interference or a less sensitive autocollimation or encircled energy method more economical and more appropriate to the quality required.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael H. Freeman, Michael H. Freeman, Caroline Gray, Caroline Gray, } "Test procedures for severely aspheric optics", Proc. SPIE 2775, Specification, Production, and Testing of Optical Components and Systems, (19 August 1996); doi: 10.1117/12.246790; https://doi.org/10.1117/12.246790

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