Holograms are three-dimensional photographic images, developed through photographic projections. They work by creating an image composed of two super imposed two-dimensional pictures of the same object seen from different points.
Unlike Virtual Reality or Augmented reality or 3-D graphics display where the image is projected in a two-dimensional surface and where the illusion of depth is applied, holograms are truly three-dimensional images that do not need special viewing equipments.
How Holograms are made?
The hologram is composed of the interference pattern between the two original images. The hologram is printed onto a set of ultra-thin curved silver plates that are made to diffract light. The diffraction splits multi-wavelength white light into each specific wavelength. When this white light strikes the silver plates, the reflections diffract into each specific color, creating two offset images made up of colors that roughly reflect what the original object looked like. The result is a three-dimensional image which we call hologram.
Categories of holograms
Holograms are categorized into two parts. One is Reflection hologram and the other one is Transition hologram. Reflection holograms use white light or laser light, reflecting off surfaces to create three-dimensional images. Lasers are considered as the main components in holographic equipment. On the other hand, you will find Transition holograms that also create a three dimensional image by utilizing monochromatic light.
Applications of holograms
Holograms have various uses. They have many commercial applications. Some of its applications are:
- Holograms are used as heads up display in military aircraft.
- Holograms are used by compact disc players to process light.
- Holographic images prevent the use of fake credit cards.
- They are used in non-destructive testing of specimen in laboratories
- Bar codes in store check out counters uses rotating computer-generated holograms called holographic scanners
- Nowadays hard drives named HOLOSTORE uses holographic computer memory systems to store lot more information.
Types of holograms
- Reflection Hologram
- Transmission Hologram
- Volume Hologram
- Embossed Hologram
- Integral Hologram
- Hybrid Hologram
- Computer Generated Hologram
- Multichannel Hologram
- Dot Matrix Hologram
- 2D Hologram
- 3D Hologram
- Image Hologram
- Transfer Hologram
- Rainbow Hologram
- Tamper Evident Hologram
- Non Tamper Evident Hologram
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