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Colloque
Plane and concave gratings have been simulated by use of holographic techniques. We have studied a modulated holographic grating that achieves self-focusing due to modulation of the diffracted wave fronts from a planar structure. The modulation is due to a multi-Gabor zone plate configuration, but other types of modulation are also possible. These gratings are expected to have better imaging properties than ordinary holographic gratings. They can be used in transmission as well as in reflection. The design and properties of these gratings will be analyzed and some results presented.
Colloque
A new and convenient method for reduction of speckle and coherent noise in holographic imagery has been investigated. The method makes use of continuous addition of sub-channel holograms during the recording step or by using shuttering devices during the reconstruction. A simple and convenient method to holographic microvision will be discussed and illustrated with experimental results.
