What is the principle of holographic projection?

The first step of holographic technology is to record the light wave information of the object by using the interference principle, that is, the shooting process: the photographed object forms a diffuser beam under laser irradiation.

The other part of the laser beam, as a reference beam, hits the holographic negative and interferes with the object light beam, converting the phase and amplitude of each point on the object light wave into spatially varying intensity, thus recording all the information of the object light wave by using the contrast and interval between interference fringes. Negative recording interference fringes become holograms, or holograms, after being developed and fixed.

2. Imaging process

The second step of holographic technology is to reproduce the light wave information of the object by using the diffraction principle, which is the imaging process: the hologram is like a complex grating. Under the irradiation of coherent laser, the diffracted light waves of linearly recorded sinusoidal holograms can generally give two images, namely the original image (also called the initial image) and the yoke image. The reproduced image has strong stereoscopic effect and real visual effect.

Every part of the hologram records the light information of every point on the object, so in principle, every part of the hologram can reproduce the whole image of the original object. Through multiple exposures, multiple different images can be recorded on the same negative, and they can be displayed separately without interference.

3. Laser display+holography = true 3D laser holography.

When laser display meets holographic technology, a new technology called laser holography was born. Laser holography refers to a technology that allows diffracted light emitted from an object to be reproduced in the same position and size as before. Observing this object from different positions, the image it displays will also change. So the photos taken by this technology are three-dimensional.

Laser display has many unique advantages, such as large color gamut, long life of light source, energy saving and environmental protection. Therefore, the picture it presents is bright and rich in color, with a sense of three-dimensional layering, and there is a lot of room for integration with cutting-edge technologies such as VR and holography in the future. Experts believe that laser can realize true three-dimensional through holographic technology.

Laser holographic projection technology is the reverse display of holographic technology, which essentially forms three-dimensional images on air or special three-dimensional lenses. Unlike plane screen projection, which only realizes stereoscopic effect on two-dimensional surface through perspective and shadow, holographic projection technology is a real 3D image, which can view different sides of the image from any angle of 360.