Holography is a method which uses light wave character that depicts an exact description that goes beyond options of the classic photography; it is the technique of creating holograms. A hologram is a 3 – dimensional picture made from a laser, it is the special kind of images on 2 – dimensional surfaces that create the effect of 3-dimensional objects. A hologram is technically known as wavefront reconstruction.
The basic principle of holography creating an image using two simultaneous beams of light that would interfere with each other in order to form a complex image on a suitable photographic film. These two beams of lights are created by splitting a light source into two with one source of reflecting light from the object to be photographed on the film and the other falling directly on it from the source. This way of developing image is known as a hologram. Laser light is usually used as a light source for holography.
In Transmission hologram, the reference and object waves traverse the film from the same side
In Reflection Hologram the reference and object waves traverse the emulsion from opposite sides
Holographic Stereograms refers to the recording of multiple views through a slit
Rainbow Hologram consists of 2 stages of recording that is recording regular hologram and recording rainbow hologram through a slit
Electron holography is the process of applying holography techniques to electron waves rather than applying to light waves. Today Electron holography is commonly used to study electric and magnetic fields in thin films, as magnetic and electric fields can shift the phase of the interfering wave passing through the sample
Hologram authentication is done through Identity Card, Passport, and Sticker or Tag. Hologram Stickers cannot be scanned or photocopied.
A holographic display is a type of display which uses light diffraction to develop a virtual three-dimensional image of an object. Holographic displays are unique from other forms of 3D imaging in which they do not require the use of any special glasses or external equipment to view an image.
To display a 3D hologram, there are usually 3 things required:
Uses of 3D Hologram
3D Hologram can be used in
3D holograms are suitable for all sectors, it may be industry, mechanical engineering, pharmaceuticals, medical technology, food, or other sectors, the range of possibilities are practically endless.
High Information Storage Capacity: It is useful for storing huge amounts of data with realistic details. It has a capacity of storing an unthinkable amount of data and an important thing in this data can be restored from any piece of the hologram. Since the data is stored in three dimensions it is overlapped, more reliable and secure
Security: Holograms are objects which are complex, which are difficult to make and that’s the reason why they are in use more importantly at commercial levels. Credit cards, Banknotes, etc. have security hologram to save them from cheating and fraud.