The SLM tab shows a live preview of the phase hologram currently being displayed on the spatial light modulator (SLM).
The preview updates automatically each time a new hologram is computed. While the tab is not visible the preview is paused, so switching away from it has no performance cost.
The phase pattern is displayed as a grayscale image: pixel brightness represents phase from 0 (black) to 2π (white), encoded as an 8-bit value in the range 0–255.