Yes — the recording step needs coherent light, typically a laser split into an object beam and a reference beam, because the hologram stores their stable interference pattern, not just “light” in the generic sense (UCSD notes, IntechOpen). A cleaner full paragraph is: “A hologram is made by recording the interference pattern between coherent reference light and coherent light scattered from an object, usually using a laser. In white-light reconstruction holograms—especially reflection or volume holograms—the recorded fringe layers act selectively, so when white light shines on them they strongly diffract only the wavelengths and angles that satisfy the recorded spacing, recreating the original wavefront and producing a 3D image without needing a laser for viewing” (IntechOpen, Physics of Optical Holography). The key distinction is simple: coherent light is required to make the hologram, but certain hologram types are engineered so ordinary white light can reconstruct it later.
RE: LeoThread 2026-04-29 04-01