What is holography?

Ordinary photography can only record the intensity (amplitude) information of the light on the surface of the scene, so the photo only reflects part of the light information and is a plane image of two-dimensional space.

Using laser holography technology, we can record all the information of the scene surface light, including intensity information and phase information. Therefore, it can realistically reproduce the three-dimensional space of the object. The scenery photographed from several angles by holographic technology is vivid and has a realistic three-dimensional effect. More interestingly, when the viewpoint moves up and down, left and right, people seem to see the real object, and even can see the hidden side of the original object from the side. So facing a hologram, we can not only see the front of the scene, but also see the side and back of the scene.

The fidelity of lensless holography makes people think that they can faithfully record the "shame" of ordinary lens photography.