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Programmable computer generated holograms with large space bandwidth product

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3 Author(s)
O'Brien, D.C. ; Dept. of Eng., Cambridge Univ., UK ; Wilkinson, T.D. ; Mears, R.J.

The key to programmable binary phase computer generated holograms (CGHs) is a controllable recording media with a robust phase modulation scheme. Magneto-optic and ferroelectric liquid crystal (FELC) devices have intrinsically robust π phase modulation schemes and FELC devices have produced high quality electrically programmable holograms. FELCs offer a means to create CGHs which are dynamic but the space bandwidth product (SBWP) is ultimately limited by the ability to electrically address more pixels. A fixed CGH may have a SBWP of 108 whereas the programmable devices are of order 104, and are unlikely to approach the SBWP of fixed devices. The authors present a combination of fixed and programmable holographic elements which multiplies the available SBWP of the programmable elements by orders of magnitude, with the potential to approach the SBWP of fixed elements

Published in:

Holographic Systems, Components and Applications, 1993., Fourth International Conference on

Date of Conference:

13-15 Sep 1993