Saturday, January 29, 2005


The Spatial Light Modulator(SLM) has expanded the realms of optical processing by linking the electrical and optical worlds, allowing the input of image information into the parallelism of the optical processor

A liquid crystal reflection SLM consists of an array of electrically addressable mirror overlaid
with a liquid crystal modulating layer. When immulinated with vertically polarised light the
œoff mirrors do not alter the polarisation while the “on” mirrors rotate the axis of polarisation
by 45. Sketch an optical system to read this SLM so that the “on” mirrors are bright.
If the SLM intensity reflectivity of 40%, estimate the optical efficiency of this system, where the
optical efficiency is defined as the ration of intensity of an “on” mirror over the input intensity.

[1] J. A. Neff, R. A. Athale, and S. H. Lee, "Two-dimensional spatial light modulators: a tutorial," Proc. IEEE 78, 826- 855(1990).
dmanChapter 7 & 88
[3]Appliedd Optics special issue on Spatial Light Modulators Vol 31 No 20 & Vol 33 No 14
[4] Yu Optical Processing and Optical Nerual networks, Academic Press 1995

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