High performance holographic optics for the visible and near infra-red

As a result of research into all-optical digital computing holographic techniques have been developed for producing large arrays of focusing beams to bias optical logic devices, and for interconnecting arrays of devices. These techniques, using dichromated gelatin (DCG) as the holographic medium, can reproducibly provide high performance devices for use at visible wavelengths, and the near infra-red at diode laser wavelengths (850 nm). Details of a 56×56 element lens array recorded at 514 nm for replay at 850 nm are given, as well as those of a space-invariant fanout interconnect hologram for use in an all-optical digital edge-extractor circuit. In addition, a method is given for the post-process tuning of the efficiency of holograms which allows peak efficiency to be achieved in every hologram