Spatial light modulators (SLMs) are a type of transmissive or reflective device that is used to modulate amplitude, phase, or polarization of an optical wavefront in space and time. A simple example is an overhead projector transparency. SLMs. The SPIE Digital Library offers a comprehensive collection of research articles, conference papers, and technical documents focused on spatial light modulators (SLMs), reflecting the breadth and depth of this rapidly evolving technology. The content covers various types of SLMs, including liquid. The Modulation Mechanism IV. Electrooptical Liquid Crystal SLMs I.