| 摘要 |
This invention concerns a method for the production of a hologram of at least one object wave and reconstruction of the same by means of a spherical reference/reconstruction wave, whose focal point is located at a short distance from the hologram. This distance is located during the construction and the reconstruction process, such that only one reconstructed image is generated in a given position whereas the other images are simultaneously defocused. The distance is determined on the basis of the signal to noise ratio desired at the object position and geometrical dimensions which per se are known to cause defocusing, such as hologram size, distance between the hologram and the object, and the area of hologram apertures. Thus, one of the images of different order of one object wavefront or only one of a number of wavefronts encoded on the same halogram can be reconstructed by simply adjusting the distance.
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