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oai:recercat.cat:2445/242822025-12-05T14:48:25Zcom_2072_1057col_2072_478821col_2072_478917

Diffraction theory of Fresnel lenses encoded in low-resolution devices Carcolé i Carrubé, Eduard Bosch i Puig, Salvador Campos Coloma, Juan Difracció Òptica electrònica Diffraction Electron optics A mathematical model that describes the behavior of low-resolution Fresnel lenses encoded in any low-resolution device (e.g., a spatial light modulator) is developed. The effects of low-resolution codification, such the appearance of new secondary lenses, are studied for a general case. General expressions for the phase of these lenses are developed, showing that each lens behaves as if it were encoded through all pixels of the low-resolution device. Simple expressions for the light distribution in the focal plane and its dependence on the encoded focal length are developed and commented on in detail. For a given codification device an optimum focal length is found for best lens performance. An optimization method for codification of a single lens with a short focal length is proposed. 2012-04-20T11:44:26Z 2012-04-20T11:44:26Z 1994 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0003-6935 https://hdl.handle.net/2445/24282 88022 eng Reproducció del document publicat a: http://dx.doi.org/10.1364/AO.33.000162 Applied Optics, 1994, vol. 33, núm. 2, p. 162-174 http://dx.doi.org/10.1364/AO.33.000162 (c) Optical Society of America, 1994 info:eu-repo/semantics/openAccess 13 p. application/pdf Optical Society of America Articles publicats en revistes (Física Aplicada)