| 摘要 |
A new method for holographic processing of waves by means of an optical system is disclosed. The method is based on the generation of an unrecorded hologram, herein denoted virtual hologram, which satisfies optical requirements. The virtual hologram corresponds to the modulation of a reference wave, herein denoted virtual reference wave, with the object wave for a particular object, herein denoted real object. The virtual hologram exists in space in the form of an image of a recorded hologram, herein denoted real hologram, which satisfies technological requirements and which corresponds to the modulation of the transformed virtual reference wave, herein denoted real reference wave, with the transformed object wave which corresponds to a transformed object, herein denoted virtual object. Upon transformation of the real hologram by means of the optical system and a reconstruction wave, the virtual hologram is generated in space and the real object is reconstructed therefrom. It is observed that neither the real hologram nor the virtual hologram are like regular holograms, in the sense that the virtual hologram, although somewhat similar to a regular hologram, is not registered in a physical medium, and the reconstruction with the real hologram without the optical system results in an image of transformed information which may be unrecognizable. It should be noted that the terms "virtual" and "real" are used here in another context than their usual meanings in optics.
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