Ing
Ing a device for modulating amplitude or phase of light passing through it. If the input signal is a light beam, it is called optically addressed spatial light modulator. If the input signal is electronic, it is called electrically addressed spatial light modulator. Light modulation is usually based on the electro-optic effect. In optical computing, an optically addressed spatial light modulator is a device used as a medium for controlling or switching light using light. Since a light beam cannot directly affect another light beam, a spatial light modulator is required. The modulation process can be seen, first, as the modulating light affecting the spatial light modulator, then the affected spatial light modulator modulates another light beam.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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