2026-04-17T06:35:10Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Carcolé i Carrubé, Eduard author Bosch i Puig, Salvador author Campos Coloma, Juan author 2012-04-20T11:44:26Z 2012-04-20T11:44:26Z 1994 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. Difracció Òptica electrònica Diffraction Electron optics Diffraction theory of Fresnel lenses encoded in low-resolution devices