Holography - simply explained

You've probably heard of holography in the media. We'll tell you exactly what the technology is all about.

This is holography

Holography is the next evolution in photography and film. With their help, three-dimensional objects can be reproduced in free space.

A hologram is a projection of an object that seems to float freely in space. You can walk around this projection and look at it from all sides.
To illustrate, imagine a person being projected into the center of the room. You can move around people and actually look at their back or front.
However, holography is not limited to imaging people. It can also project objects, products or entire sequences. 3D holograms don't even need glasses to view them three-dimensionally.
Precisely because people are so fascinated by technology, it is very popular. It is often used in films or at trade fairs. Holography is still too expensive for private use.

Holography itself is not a product of the present. The Hungarian Dénes Gábor had the idea for this technique as early as 1947.

In order to create a hologram, the object for the holography must first be recorded correctly. For this it is burned on a photo glass plate.
This is done using a laser that is split into two beams. The first beam illuminates the object and the glass plate from behind. The second beam hits the plate from the front.
Since the two laser beams then overlap, the hologram is created on the glass plate. After exposure, this plate can be illuminated again at any time and the hologram appears.
However, work is also being carried out at high pressure on processes that allow holography with moving objects and ad hoc. In principle, this technology already exists, but it is still very expensive.
In the future, it may well be that we will also have holograms in our living rooms with which all kinds of content can be viewed. Telephone calls with the person in front of him as a hologram are also conceivable.

In the next practical tip we will show you how you can create your own 3D hologram with a few CD cases and your smartphone.