What is still developing is holographic storage technology. When we talk about the characteristics of holography, we mentioned the ability to store information, that is, the ability to record information. Theoretically, the information stored in optical disc is about 0/06 bit per square centimeter 108 bit per square centimeter, which is higher than 100 times! And the time to read information is only one millionth of a second!

Now, information can be stored in materials. The material used in holography is not a thin film, but a whole crystal that can store 65438+ ten thousand books. A library only needs to store a small number of recording crystals. It seems a bit whimsical, but it is hopeful. More importantly, the development of holographic storage will promote the development and upgrading of computers.

Generally, holograms can only be made one by one, and the price is very high; In addition to scientific research, it can only be used as a high-grade work of art, and a new relief holographic technology appeared in the 1980s. To make holograms by this method, first of all, we must make metal micro-relief plates; Using it as a printing plate, the hologram is pressed out on special paper coated with metal film. This is more convenient than printing stamps, and can be produced in large quantities, with greatly reduced cost and wider application.

This kind of holography not only has three-dimensional effect; In sunlight or light, it presents a variety of colors, which is more beautiful on a silvery white metal background. People use it to decorate books, toys and souvenirs, which is very attractive.