On the assumption that a hologram is a superposition of zone plates, one from each point in the object, the authors have produced, by sequential printing of zone plates, holograms which reconstruct a pattern of several bright points on a dark field. The pattern may be prescribed in advance and may be three dimensional. The validity of the method is examined mathematically.
William J. Siemens-Wapniarski and M. Parker Givens, "The Experimental Production of Synthetic Holograms," Appl. Opt. 7, 535-538 (1968)