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Holographic designs and manufactures

Product development processes are accelerating the implementation of digital design techniques. High end applications demand accurate "replacement reality" approaches, where 3D visual, tactile and auditory cues allow multiple users to interact with the digital world, in a natural and intuitive fashion. Computer generated holography is the only 3D visualisation method thought to be capable of meeting these demands. computer generated hologram (CGH), the object used to form the hologram need only exist as a mathematical description - the physical interference of light waves is replaced by a calculation step, where the intensity pattern on the CGH design plane is determined. This pattern can then be written to a reconfigurable device capable of modulating a light wave. Current examples of such spatial light modulators (SLM) include various liquid crystal, acousto-optic or micromachined devices. Such holographic displays are the only 3D visualisation approach thought to be capable of meeting all the demands of the “replacement reality” system under discussion and are the ultimate 3D display technology. There are several classes of CGH design algorithm. They all attempt to calculate the required interference pattern on the CGH design plane, and thus the pixel greyscale values on the SLM required to diffract light and produce the 3D image. Fourier based algorithms. These exploit the speed of the fast Fourier transform (FFT) to compute the CGH. These are often simple to implement (e.g. the Ping-Pong algorithm [Ichioka]), but are not computationally efficient and here our role will be significant.