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- W2033504255 abstract "AbstractTesting of aspherics by synthetic holography has many attractive features. Use of in -lineholograms and tracing to scale of the hologram represents in our idea a simplification ofthe method. We recall the principles of order filtering for in -line holograms. We also pre-sent the interferograms obtained in a comparison of the holographic method with classicalinterferometry, when testing a parabola opened at f/0.6.IntroductionMost surfaces used in optics are spherical or plane, for they may be produced by mutualgrinding between the surface and the tool on unexpensive machines. Furthermore, these me-thods allow to achieve a high surface quality and sufficiently small surface undulations.The main difficulty that arises in the polishing stage is obtaining the good overall shape.Researches on the production of aspherical surfaces have mainly been oriented towardssingle point turning. These techniques produce faults over a great range of frequencies,presenting simultaneously shape, undulation and roughness. In particular, we may mentionthat the study of the MTF,of the straylight level and of the circled energy shows that sur-face undulations degrade the image quality even quicker than the other defects. Testing anaspheric mutt therefore include the measurement of these three defects. In this respect,synthetic holography appears to be a suitable method for shape and undulation measurement.Choice of in -line hologramsCarrier frequency holograms 1: 2, 3,4 were initially preferred to in -line holograms. Thiswas probably due to the impossibility of efficiently filtering spurious orders in most otherapplications of holograms. They were however employed with no filtering or with opaque stops" @default.
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- W2033504255 date "1981-05-13" @default.
- W2033504255 modified "2023-10-01" @default.
- W2033504255 title "<title>Control Of Aspherics By In-Line Computer-Generated Holograms</title>" @default.
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- W2033504255 doi "https://doi.org/10.1117/12.958965" @default.
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