The fill light is typically positioned opposite of the key light to literally fill in the shadows that the key light creates. In film, television, stage, or photographic lighting, a fill light (often simply fill) may be used to reduce the contrast of a scene to match the dynamic range of the recording media and record the same amount of detail typically seen by eye in average lighting and considered. A simple example is an overhead projector transparency. SLMs. Spatial Light Modulators are among the most powerful optical components in modern photonics research — used in a wide range of spatial light modulator applications including adaptive optics, STED microscopy, optical trapping, holographic beam shaping, and femtosecond pulse compression.
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