Crespo Vázquez, DanielAlonso Fernández, JoséBernabeu Martínez, Eusebio2023-06-202023-06-202000-070740-323210.1364/JOSAA.17.001231https://hdl.handle.net/20.500.14352/59239© Optical Society of America. This work was partially supported by the project Tecnologías Avanzadas de la Producción, TAP 98\0862, of the Comisión Interministerial de Ciencia Y Tecnología (CICYT).It is a well-known fact that one grating can act as an imaging element for another grating when the first is illuminated with an extended monochromatic light source. The conditions for image formation in such a system are studied when the finite size and position of the broad light source are considered. From the presented analysis, expressions for the location and the depth of focus of such images can be derived.engjournal articlehttp://dx.doi.org/10.1364/JOSAA.17.001231http://www.opticsinfobase.orgopen access535DiffractionÓptica (Física)2209.19 Óptica Física