Brief introduction of three-dimensional holographic imaging technology

Basic mechanism of holographic display

Since the advent of laser in 1960s, holography has developed rapidly. Its basic mechanism is to record the amplitude and phase of the object's light wave simultaneously by light wave interference method. Because the holographic reconstructed light wave retains all the amplitude and phase information of the original light wave, the reconstructed object has exactly the same three-dimensional characteristics as the original. In other words, when people watch holographic images, they will get exactly the same visual effects as the original ones, including various positional parallax, which is the theoretical basis of holographic three-dimensional display. In this sense, holography is the real three-dimensional image, and the above-mentioned image synthesized by stereo pair is at best a quasi-three-dimensional image (without the feeling of vertical parallax). After 1980s, laser holography developed rapidly and became a new high-tech industry. In laser holographic technology, holographic display technology has attracted much attention because it is closer to people's daily life. It can not only make realistic three-dimensional images to beautify people's lives, but also be used in securities, commodity anti-counterfeiting, commodity advertising, promotion, artistic pictures, exhibitions, book illustrations and artistic decoration, packaging, interior decoration, medicine, criminal investigation, physical evidence photography and identification, building three-dimensional imaging, scientific research, teaching, information exchange, portrait three-dimensional photography and three-dimensional film and television and many other fields. In recent years, it has also been developed into a wide range of holographic packaging materials and has been applied. Because white light reconstruction holography technology can observe three-dimensional images of objects in the natural environment during the day or under ordinary white light irradiation, we have been studying the latest development and application of holography technology, hoping to make holographic display technology develop rapidly through our own efforts.