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What is a hologram, and how does it work?

Kristina Chan

on 27 April 2012

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Transcript of Holograms

What they are and how they work Holograms Holograms were first developed in the early 1940s by Dennis Gabor. He discovered the technique when working on electron microscopes, and his method is still used in modern electron microscopes DCG hologram, made with 445nm laser and diochomed gelatin A Presentation by Kristina Chan & Kaytee Doonan
Lasers Commonly Used:
Red lasers, usually helium-neon (HeNe)
- Coherent light is necessary

Lenses Used In Holography:
Diverging lenses to make the beam spread out Beam splitter uses mirrors and prisms to split a beam into two beams—the object beam, which reflects off the object onto the photographic emulsion, and the reference beam, which hits the emulsion and only reflects off the mirror A hologram is an image that appears 3D. Not only does it seem to have depth, but when viewed from different angles, you can see different perspectives. Holographic film:

-Records light at a very high resolution
-A layer of light-sensitive compounds on a transparent surface
-Able to record extremely small changes that take place over microscopic distances Mirrors are used to direct beams of light Optical holography became much more advanced with the development of the laser in the 1960s. There are several different types of holograms, such as reflection and transmission holograms Reflection holograms (also known as Denisyuk holograms) are viewed using white light on the side being viewed. These holograms can be multi-color, making these images look realistic. Transmission holograms originally had to be viewed by shining a laser behind them, but now can be seen with white light. Some types of transmission holograms have a rainbow look. Both reflection and transmission holograms can be made with the same materials. Applications of holograms & Advancements Japanese scientists have created holograms you can "touch." While you cannot feel them, sensors enable them to detect your hand, allowing you to interact with them. Electronic companies are currently working on holographic data storage. This method stores information using an optical interference pattern created using a laser and a photosensitive material. Source Links: http://www.genewscenter.com/Press-Releases/GE-Breakthrough-in-Micro-holographic-Storage-Technology-Supports-500-Gigabyte-Disc-at-Blu-ray-Speed-3245.aspx



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