What is hologram?

What Does hologram Mean

The first step necessary to discover the meaning of the term hologram that concerns us now is to know its etymological origin. In this case, we have to underline that it is the result of the sum of two lexical components of Greek:

-The noun “holos”, which can be translated as “everything”.

-The word “grass”, which is synonymous with “plotted message” and “written message”.

Likewise, it is interesting to know that the person in charge of coining this term was none other than the Hungarian physicist Denis Gabor (1900 - 1979). Specifically, he gave it a theoretical shape in 1948. However, he had to wait until the 1960s to be able to demonstrate the existence of the hologram in a practical way. And that discovery would lead him to obtain the Nobel Prize in Physics in 1971.
A hologram is an image that is obtained from holography . Holography is called, for its part, the technique that, making use of lighting by lasers , manages to generate colorful images in three dimensions.

It can be said, therefore, that a hologram is a three-dimensional image created through the use of a laser. The laser allows the microscopic recording of a photosensitive film: when interference occurs between two light beams , the light from one of the beams can be reflected onto the object. Said light, upon receiving another from a certain perspective, projects the three-dimensional image.
With proper lighting and processing, the 3D image can be projected beyond its limits, allowing the viewer to see it seamlessly and changing the perspective according to position .
Leaving aside the technical details, in colloquial language it can be said that a hologram is a laser-generated image that is recorded on a sensitive film capable of producing objects in relief. That is why the three-dimensional image seems to be suspended in space and can be seen from different perspectives.
The observer, before a hologram, has the impression of being in front of a real (physical) element . This makes holograms used to generate realistic experiences, for example at concerts .
In 2014 , to cite one case, Michael Jackson "appeared" at the Billboard Awards through a hologram. Thus Jackson , who died five years earlier, performed "live" with a group of dancers.
In the same way, we cannot ignore that the hologram has become a widely used element at the tourist level. Thus, we can find that it is used in certain monuments to give prominence and presence to characters who have already died or to events in the past.
A good example of this is Stirling Castle (Scotland). In this fortress, which dates from the 15th century, you can learn about the history of the city and when you access the interior of it there is a hologram, specifically, the one that comes to represent one of the most important figures of the past of the place: local hero William Wallace (1270 - 1305). Specifically, it is this that thanks to the hologram 'resurrects' to welcome visitors.

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