Experimental study of the effects of the spatial filtering on off-axis digital holography operating out and in of the diffraction limitEstudio experimental de los efectos del filtrado espacial en holografía digital fuera de eje operando fuera o dentro en el límite de difracción ABSTRACT:This paper presents a theoretical and experimental analysis of the close relationship between the recording of digital holograms operating out or in of the diffraction limit and the spatial filtering process in the overall performance of the numerical reconstruction of the digitally recorded holograms. The results allow to conclude that it is not possible to make a correct spatial filtering for a reliable numerical reconstruction of the recorded holograms, if the recording is not made in the diffraction limit or presents overlapping of the diffraction orders.Key words: Digital holography, spatial filter, diffraction limit. RESUMEN:En este trabajo se hace un análisis teórico y experimental de la estrecha relación que existe entre el registro de hologramas digitales operando o no en el límite de difracción y del proceso de filtrado espacial en el desempeño global de la reconstrucción numérica de hologramas registrados digitalmente. Los resultados obtenidos permiten concluir que no es posible hacer un filtrado espacial correcto del holograma para su posterior reconstrucción numérica, si el registro de holograma no es realizado en el límite de difracción o en su defecto sin solapamiento de los órdenes de difracción.Palabras clave: Holografía digital, filtrado espacial, límite de difracción.
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