In its pure form, holography requires the use of laser light for illuminating the subject and for viewing the finished hologram. In a side - by - side comparison under optimal conditions, a holographic image is visually indistinguishable from the actual subject. A microscopic level of detail throughout the recorded volume of space can be reproduced. In common practice, however, major image quality compromises are made to eliminate the need for laser illumination when viewing the hologram, and sometimes, to the extent possible, also when making it. Holographic portraiture often resorts to a non-holographic intermediate imaging procedure, to avoid the hazardous high - powered pulsed lasers otherwise needed to optically "freeze '' living subjects as perfectly as the extremely motion - intolerant holographic recording process requires. Holograms can now also be entirely computer - generated to show objects or scenes that never existed.
what is a three dimensional image produced by laser light
hologram hologram Hologram