Modélisation et simulation de composants optiques diffractifs et pixellisés en vue de leur caractérisation et de leur optimisation.

Céline Benoit-Pasanau 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Scop
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : This thesis is devoted to the design and the improvement of two dimensional pixelated components compatible with low cost, non conventional optical technologies. As these com ponents introduce diffraction effects, our goal is to quantify and reduce them to improve the quality of the images they provide in comparison to usual periodic geometries. For that purpose, we break the periodicity of the cell centres of conventional Spatial Light Modu- lators (SLM). The result is a better angular distribution of the diffracted intensity outside the direct image, at the cost of a small deterioration of its quality quantified by its Strehl ratio. We introduce an adjustment of the Voronoi structure notion to SLM and we show their superiority over conventional ones. Thus, they should be preferred to make active components. We determine several optimal cases where the diffraction peaks produced by the cell walls and the pixelation of the phase function implemented on the SLM are replaced by a diffraction halo. The prototypes that were made confirm the simulations results and prove the technical feasibility of the chosen ¯lling process in spite of some limits that we analyze. Finally the potential of pixelated components is extended to applications other than ophthalmic by showing that they can improve the performances of a camera lens. Keywords : Diffraction, Spatial Light Modulator (SLM), Voronoi diagrams
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Theses
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Céline Benoit-Pasanau. Modélisation et simulation de composants optiques diffractifs et pixellisés en vue de leur caractérisation et de leur optimisation.. Optique [physics.optics]. Université Paris Sud - Paris XI, 2010. Français. ⟨pastel-00714697⟩

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