A brief history of holographic research

Hologram was put forward by Gabor in 1948 to improve the imaging quality of electron microscope, and its significance lies in complete recording. Dennis gabor's experiment solved the basic problem in the invention of holography, that is, the recording and reconstruction of wavefront. However, due to the lack of bright coherent light source (laser) at that time, the imaging quality of hologram was poor. With the appearance of 1962 laser, Lise and Upatnieks introduced the concept of carrier frequency to Gabor holography and invented off-axis holography, which effectively overcame the main problem of poor hologram imaging quality at that time-twins, and the display of three-dimensional objects became the focus of holographic research at that time, but this imaging science far exceeded the economic development at that time, and the cost of making and observing such holograms was very expensive. 1969, Benton invented rainbow holography, which set off a new climax of holographic stereoscopic display characterized by white light display. Rainbow hologram is a kind of plane hologram that can display white light. Compared with Denisyuk's reflection hologram, it can not only observe bright stereoscopic images under ordinary incandescent lamps, but also has the advantages of simple hologram processing technology and easy replication.