Computer-generated holography | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-11

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Computer-generated_holography


00:01:58 1 Overview
00:03:16 2 Wavefront computation
00:04:47 2.1 Fourier transform method
00:06:49 2.2 Point source holograms
00:09:40 3 Interference pattern encoding
00:11:51 4 Reconstruction
00:12:54 5 CGH applications
00:13:55 6 CGH in electron optics



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SUMMARY
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Computer-generated holography (CGH) is the method of digitally generating holographic interference patterns. A holographic image can be generated e.g. by digitally computing a holographic interference pattern and printing it onto a mask or film for subsequent illumination by suitable coherent light source.
Alternatively, the holographic image can be brought to life by a holographic 3D display (a display which operates on the basis of interference of coherent light), bypassing the need of having to fabricate a "hardcopy" of the holographic interference pattern each time. Consequently, in recent times the term "computer-generated holography" is increasingly being used to denote the whole process chain of synthetically preparing holographic light wavefronts suitable for observation.Computer-generated holograms have the advantage that the objects which one wants to show do not have to possess any physical reality at all (completely synthetic hologram generation). On the other hand, if holographic data of existing objects is generated optically, but digitally recorded and processed, and brought to display subsequently, this is termed CGH as well. Ultimately, computer-generated holography might serve all the roles of current computer-generated imagery: holographic computer displays for a wide range of applications from CAD to gaming, holographic video  and TV programs, automotive and communication applications (cell phone displays) and many more.