Computer-generated diffraction gratings in optical region

Raimo Veil Johannes Silvennoinen; Rauno M. Hamalainen; Jari T. Rasanen

doi:10.1117/12.50107

1 October 1991 Computer-generated diffraction gratings in optical region

Raimo Veil Johannes Silvennoinen, Rauno M. Hamalainen, Jari T. Rasanen

Proceedings Volume 1574, Intl Colloquium on Diffractive Optical Elements; (1991) https://doi.org/10.1117/12.50107
Event: International Colloquium on Diffractive Optical Elements, 1991, Szklarska Poreba, Poland

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.

Citation Download Citation

Raimo Veil Johannes Silvennoinen, Rauno M. Hamalainen, and Jari T. Rasanen "Computer-generated diffraction gratings in optical region", Proc. SPIE 1574, Intl Colloquium on Diffractive Optical Elements, (1 October 1991); https://doi.org/10.1117/12.50107

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