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Proceedings Paper

Computer-generated diffraction gratings in optical region
Author(s): Raimo Veil Johannes Silvennoinen; Rauno M. Hamalainen; Jari T. Rasanen
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Paper Abstract

The conventional computer generated holograms (CGH) presented in literature are calculated with the discrete Fourier transform (FFT). In optical reconstruction of the CGH the spatial components diffracted from a photographically reduced hologram are collected by a lens to produce a reconstructed picture. The angles between the diffracted spatial components and the optical axis are typically in the range of milliradians. On the other hand, computer generated diffraction gratings can be calculated without any Fourier transformation by using discrete wavefront theories. The reduction of the holograms to the right scale can be made, e.g., by using focused electron beam, focused laser beam, or photographic process. In our applications some diffraction gratings are calculated with the aid of the Stardent 3040 system with four MIPS R3000 parallel processors (64 MB) and reduced by using photographic processes to complete the diffraction gratings into optical range applied by the conventional holography.

Paper Details

Date Published: 1 October 1991
PDF: 5 pages
Proc. SPIE 1574, Intl Colloquium on Diffractive Optical Elements, (1 October 1991); doi: 10.1117/12.50107
Show Author Affiliations
Raimo Veil Johannes Silvennoinen, Univ. of Joensuu (Finland)
Rauno M. Hamalainen, Univ. of Joensuu (Finland)
Jari T. Rasanen, Univ. of Joensuu (Finland)


Published in SPIE Proceedings Vol. 1574:
Intl Colloquium on Diffractive Optical Elements

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