Journal ArticleDOI
Synthetic Holography for Optical Testing
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TLDR
In this paper, a modified procedure along with the concept of aberration balancing has been proposed for computer generated holograms (CGHs) for the testing of aspherical surfaces.Abstract:
—Computer Generated Holograms (CGH’s) have been used for the testing of aspherical surfaces. The CGH acts as a reference element in an interferometric configuration. The CGH’s may be generated either by coding both amplitude and phase or by coding only the phase of the wavefront. It may be safely assumed that the wavefronts encountered during testing are of uniform amplitude and hence the methods using only phase coding for the generation of the hologram are of more relevance to testing. We have modified the procedure by Birch et al for generating CGH. This modified procedure along with the concept of aberration balancing extends the capability of the CGH; even steep aspherics can be tested. The CGH’s have been generated for the wavefront from a plano-convex lens both for its axial and off-axial positions. The results of the experiments indicate that the CGH and provide a reference wavefront to an accuracy better than λ/10. An analysis of the errors introduced during fabrication and use of the CGH has been presented.read more
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Journal ArticleDOI
Computer Generated Holography
TL;DR: In this paper, the state-of-the-art of computer generated holography (CGH) can be found in various coding schemes to record both the amplitude and phase of the field at the hologram plane.
References
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Book
Principles of Optics
TL;DR: In this paper, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Journal ArticleDOI
Binary Fraunhofer Holograms, Generated by Computer
Adolf W. Lohmann,D. P. Paris +1 more
TL;DR: A theory for binary holograms is developed that is equivalent in terms of image reconstruction with ordinary holograms, proven theoretically and verified experimentally.
Journal ArticleDOI
Sampled Fourier Transform Hologram Generated by Computer
TL;DR: A technique to determine a real nonnegative function representing the transmittance of a synthesized hologram is described, which uses the positions of the samples in the synthesizer to record the phase information of a complex wavefront.
Journal ArticleDOI
Binary Synthetic Holograms
TL;DR: The positions and width of the fringes in a binary synthetic hologram are determined by the points at (x,y) that satisfy -q/2, where q is a constant determining the fringe width.
Journal ArticleDOI
Using Computer Generated Holograms to Test Aspheric Wavefronts
James C. Wyant,V. P. Bennett +1 more
TL;DR: An analysis of the errors produced by emulsion movement, incorrect hologram size and position, and distortion in hologram plotter and photoreduction lens is given, and it is shown that all the errors are proportional to the slope of the aspheric wavefront.