The first necessary step to discover the meaning of the term hologram that concerns us now is to know its etymological origin. In this case, we have to emphasize 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 “gram”, which is synonymous with “written 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 theoretical form 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 obtained from holography . Holography, for its part, is the technique that, using laser lighting, manages to generate colorful three-dimensional images.
It can be said, therefore, that a hologram is a three-dimensional image created through the use of a laser. The laser allows microscopic recording of a photosensitive film: when interference occurs between two beams of light , the light from one of the beams can be reflected on the object. This 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 without discontinuities and changing the perspective according to their position .
Leaving aside the technical details, in colloquial language it can be stated that a hologram is an image generated with a laser 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, when faced with a hologram, has the impression of being in front of a real (physical) element . This means that holograms are 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. In this way, Jackson , who had 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 in tourism. Thus, we can find that it is used in certain monuments to give prominence and presence to deceased figures or events from the past.
A good example of this is Stirling Castle (Scotland). In this fortress, which dates back to the 15th century, you can learn about the history of the city and when you enter it there is a hologram, specifically, which represents one of the most important figures from the place's past: the local hero William Wallace (1270 – 1305). Specifically, it is this one that, thanks to the hologram, "resurrected" to welcome visitors.