What technology is used for holograms?

Swati B 

Holograms are a type of optical illusion that creates the appearance of a three-dimensional image. They are created using a technique called holography, which combines the principles of optics and photography to record the light scattered from an object and project it back into space as a seemingly three-dimensional image.

There are a few different technologies used to create holograms. The most common method is called laser holography, which involves using a laser to illuminate the object being recorded, and then capturing the light scattered from the object using a holographic film or plate. The resulting hologram is a recording of the object's light field and can be used to reconstruct the object's image when illuminated with a laser.

Another method is called "transmission holography", in which a laser is shone on the object and the light that passes through it is recorded on a holographic film or plate. The resulting hologram can be used to reconstruct the object's image when illuminated from the side, or when seen through the hologram.

Another method is called "computer-generated holography" which uses computer algorithms to create a holographic image. This method is used for creating 3D images and videos that can be used in virtual reality and augmented reality applications, such as smartphones, tablets, and other portable devices.

There are also holographic display technologies like volumetric and holographic projection, they are used in special events, and showcases, where a 3D image is projected into space.

In summary, the main technology used to create holograms are lasers and holographic films or plates, with computer-generated holography increasingly being used to create 3D images and videos in virtual and augmented reality applications.