how to make holograms
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It is possible to make holograms of much less stable objects by using a pulsed laser which produces a large amount of energy in a very short time (μs or less). These systems have been used to produce holograms of live people. A holographic portrait of Dennis Gabor was produced in 1971 using a pulsed ruby laser
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- The first step to this project is gaining a basic understanding of how holograms work. Although these creations are easiest to describe as holograms, they are actually the result of the Pepper’sGhost effect. Pepper’s Ghost is an illusion effect that makes images appear like holograms or ghostly apparitions. It is a common special effect technique used in theaters, amusement parks, concerts, and museums. The illusion is made possible with glass (or glass-like surfaces such as a transparency) and light. Because of ray optics, light is reflected and refracted to produce an image that appears like a hologram.
- To start this project, your students will need to create pyramid projectors. These are the clear, pyramid-shaped containers that will help reflect and refract the light. This step sounds complicated, but all you need to do is run a transparency through the copy machine.
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