Information Storage by Holography

The underlying ideas for holography are presented and the nature of the laser beam which is needed for holography is discussed. One example of an arrangement for making holograms is described, and some examples are planned for showing by laser projection onto a screen. From these sample holograms some of the characteristics of holograms are illustrated. These include the fact that small areas of the hologram includes information for a complete image, and the fact that different viewpoints are carried by different subareas of the hologram which gives three-dimensional information storage. Finally, applications of holography to shape description, vibration measurement, and small deflection measurement are discussed.