Introduction Holographic projection technology is a high-tech technology that has emerged in recent years. It is a method that uses the principles of interference and diffraction to record and reproduce real three-dimensional images of objects. It is changing the aesthetic attitude of those traditional stage acousto-optic technology with a brand new thing. This holographic projection technology has been widely used in all aspects of society in response to the times. As shown in the figure, this is a holographic projection technology introduced by a high-end hotel in the UK to guide the occupants to the designated room. The live image of the characters on the screen is colorful, with high contrast and clarity, and a strong sense of space and perspective. This technology creates a dual world of virtual and reality with sci-fi effects. principle The holographic technique is a technique for recording and reproducing the real three-dimensional image of an object using the principles of interference and diffraction. The first step is to record the light wave information of the object using the principle of interference, which is the shooting process: the object under the laser irradiation forms a diffuse object beam; another part of the laser is used as a reference beam to hit the holographic film, and the object beam superimposed Interference occurs, converting the phase and amplitude of each point on the object light wave into a spatially varying intensity, thereby recording all the information of the object light wave using the contrast and spacing between the interference fringes. After the negative film with interference fringes undergoes development, fixing and other processing procedures, it becomes a hologram, or hologram; The second step is to use the principle of diffraction to reproduce the light information of the object. This is the imaging process: the hologram is like a complex grating. Under the irradiation of coherent laser light, the diffracted light wave of a linearly recorded sinusoidal hologram can generally give two The images are the original image (also called the initial image) and the conjugate image. The reproduced image has a strong three-dimensional sense and has a real visual effect. Each part of the hologram records the light information of each point on the object, so in principle each part of it can reproduce the entire image of the original, and multiple different images can be recorded on the same negative film through multiple exposures. And can be displayed separately without disturbing each other. Tsinghua University, China Science and Technology, China Optoelectronics Research Institute, Zhejiang University, National University of Defense Technology, Shanghai Jiaotong University, Jiangsu University, etc. In addition to optical holography, infrared, microwave, and ultrasonic holography technologies have also been developed. These holography technologies have important significance in military reconnaissance and surveillance. application The application of holographic projection technology in dance beauty can not only produce a three-dimensional aerial illusion, but also enable the illusion to interact with the performer to complete the performance together and produce a shocking performance effect. From the use of holographic projection technology in the Disel fashion show catwalk, the beautiful holographic projection screen accompanied the model's steps to bring the audience to another world, as if the audience experienced a dual world of virtual and reality. Then to the use of holographic projection technology in the fantasy theater "Anime Master Norman", stage art and movie fragments have shown an extraordinary fusion in the same space, showing the audience the latest innovations in the world's multimedia art. The service and sales industries are most in need of a mass foundation, and it is king to maximize consumer appeal. The use of holographic projection technology in this regard has gathered people's attention from a new perspective and aroused consumers' desire for consumption. The ultimate goal of the exhibition industry is how to sell products, and how to maximize the attention of exhibitors has become a magic weapon for this industry. For the exhibition industry, a 360-degree phantom imaging system was launched in real time. The three-dimensional image was suspended in the mid-air imaging of the real scene, creating an atmosphere that is also illusory and true. The effect is unique and the sense of technology is full. Opened up a new marketing direction for the exhibition industry. prospect The holographic projection technology breaks through the traditional limitations of sound, light and electricity, and brings beautiful pictures to the audience, giving people a dual world feeling of the coexistence of virtuality and reality. The method of holography extends from the optical field to other fields. For example, microwave holography and acoustic holography have been greatly developed and successfully applied in industrial medical treatment. Seismic waves, electron waves, X-rays and other holograms are also being studied in depth. Holograms have extremely wide applications. Undoubtedly, such as the shock wave used to study rocket flight and the non-destructive inspection of the honeycomb structure of the aircraft wing, the future development potential of the holographic projection technology market will be inestimable. 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