Cell-oriented vs. point-oriented techniques in diffractive optical element design: towards a definitive comparison

Laurent Bigue

doi:10.1117/12.513849

18 February 2004 Cell-oriented vs. point-oriented techniques in diffractive optical element design: towards a definitive comparison

Laurent Bigue

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Proceedings Volume 5249, Optical Design and Engineering; (2004) https://doi.org/10.1117/12.513849
Event: Optical Systems Design, 2003, St. Etienne, France

Abstract

Nowadays, in computer-generated diffractive optical element design or correlation filter computation, cell-oriented techniques incepted in the 1960’s or early 1970’s are sometimes still being used. It can seem surprising since point-oriented techniques have proved to provide better performance than cell-oriented ones. In this paper, we show that unless extremely short computation times are required, cell-oriented techniques should be avoided and point-oriented techniques should be preferably used because they always provide significantly better performance for a given space-bandwidth product: we extend the approach we already used for the implementation of correlation filters onto spatial light modulators (SLMs) to the design of diffractive optical elements (DOEs) and their implementation onto SLMs. In any case, even if the design is much simpler and the physical meaning clearly appears when cell-oriented methods are used, the performance in terms of diffraction efficiency and signal to noise ratio remains poor. An objective comparison is given with the help of the optimal trade-off framework. Simulations as well as experimental results are provided for various cell-oriented and point-oriented methods. Optical implementations are carried out with a twisted nematic liquid crystal SLM.

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Laurent Bigue "Cell-oriented vs. point-oriented techniques in diffractive optical element design: towards a definitive comparison", Proc. SPIE 5249, Optical Design and Engineering, (18 February 2004); https://doi.org/10.1117/12.513849

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KEYWORDS

Diffractive optical elements

Optical design

Signal to noise ratio

Fourier transforms

Spatial light modulators

Binary data

Computer generated holography

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