Holographic popular understanding

The original shooting object can be accurately reproduced.

Holography refers to a technology that allows diffracted light emitted from an object to be reproduced in the same position and size as before.

So the photos taken by this technology are three-dimensional. Holography can be used for optical storage, reproduction and information processing. Although holographic technology has been widely used to display static three-dimensional images, it is still impossible to display objects arbitrarily by using three-dimensional volume holographic technology.

To sum up, holography is a video recording method without ordinary optical imaging system, and it is a new technology of stereo photography and wavefront reconstruction developed in the 1960s. Because holography can record all the information emitted from the surface of an object (that is, the amplitude and phase of light waves) and completely reproduce all the information of the light waves of the photographed object, holography has been widely used in production practice and scientific research.

Generally speaking, photography refers to imaging a space object on a plane according to the principle of geometric optics imaging, and then recording the amplitude (intensity) of light waves on this plane. The following is a simple schematic diagram. Shoot the candle flame with a camera to get the amplitude information of the object light wave (where it is bright and where it is dark).

If we can record the amplitude and phase of the object light wave and reproduce it under certain conditions, we can see a three-dimensional image containing the intensity and phase of the object. So it is called "holography", that is, "full information", that is, "intensity and phase".