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[[File:Spatial light modulator principle.png|thumb|SLM principle of operation. Light comes in on the left, and a pattern is produced in the light that goes out on the right.]]
A '''spatial light modulator''' is a gadget that can vary the properties of [[light]] that goes through it or reflects off of it. It can modulate the intensity and/or phase of light across a two-dimensional physical array. It can be used for [[computer-generated holography]].
A '''spatial light modulator''' is a gadget that can vary the properties of [[light]] that goes through it or reflects off of it. It can modulate the intensity and/or phase of light across a two-dimensional physical array. It can be used for [[computer-generated holography]].