Home > Science Fact Finder > General Science and Technology - What Is Holography?

1. Printable Version
2. Download PDF
3. Cite this Page

What is holography?

Holography is the process or technique of making holograms, which are three-dimensional images. A hologram is produced by the interaction of two beams of laser light (light composed all of the same color, or wavelength), which have been split from a single beam by a mirror.

One beam, called the object beam, lights up the subject of the hologram. These light waves are reflected onto a photographic plate. The other beam, called a reference beam, is reflected directly onto the plate itself. The two beams come together to create, on the plate, an "interference pattern." After the plate is developed, a laser light is projected through this developed hologram at the same angle as the original reference beam, but from the opposite direction. The pattern scatters the light to create a projected, three-dimensional, ghostlike image of the original object.

Hungarian-born scientist Dennis Gabor (1900-1979)...

Join eNotes

The above is a free excerpt. Get total access to this content with the:

eNotes Pass

1. Inventions And Fairs
   1. Who invented the Xerox™ machine?
   2. Who invented the electron microscope?
   3. What is the formula for invisible ink?
   4. Who invented velcro™?
   5. Who invented teflon?
   6. Who invented the zipper?
   7. Which scientific discoveries were made accidentally?
   8. What is the origin of blue jeans?
   9. Which tools were used by Neanderthal man?
   10. Who invented the Slinky™?
   11. Who invented Rubik's cube™?
   12. What is the origin of the fire alarm box?
   13. How does a breathalyzer determine the alcohol level of the breath?
   14. How are scratch and sniff cards made?
   15. What is the name of the chemical used in watches to make them glow in the dark?
   16. When was cement first used?
   17. How are compact discs (CDs) made?
   18. How are colored fireworks made?
   19. Why are the letters all mixed up on the typewriter keyboard?
   20. When was the first world's fair?
   21. What is contained in the time capsule buried at the site of the New York World's Fair in 1940?
2. Accomplishments
   1. Who was the first American to receive a Nobel Prize?
   2. Who was the first American woman to win a Nobel Prize and how many women have received the prize?
   3. What were the discoveries of John Bardeen, the only person to win two Nobel Prizes in the same field?
   4. For what accomplishments did Marie Curie receive a Nobel Prize?
   5. What is the National Inventors Hall of Fame?
3. Patents And Trademarks
   1. What types of patents are available?
   2. What is the Guzman prize?
   3. How long does a patent a trademark, or a copyright protect the holder?
   4. What cannot be patented?
   5. What is the difference between the symbols ™ and ® when used with a trademark?
   6. Which patent was issued to a U.S. president?
   7. For what is Percy Lavon Julian noted?
   8. Which patents were issued to Mark Twain?
4. Oddities, Hoaxes, And Accidents
   1. What was the world's greatest fraud?
   2. What is the Bermuda Triangle?
   3. What is a jackalope?
   4. Which industrial accidents have become major disasters?
   5. What was the Great Boston Molasses Disaster of 1919?
5. Technological Achievements
   1. Which scientific and technological event was the most important in U.S. history?
   2. What are the ten outstanding engineering achievements of the last thirty years?
   3. What is "High Technology" or "High Tech"?
   4. What is the new science of chaos?
   5. In which industries are robots being used?
   6. What does the acronym "LASER" stand for?
   7. What is holography?
6. Weapons
   1. Who invented the bowie knife?
   2. When was the Colt revolver patented?
   3. When and where was gunpowder invented?
   4. Who invented dynamite?
   5. What was the Manhattan Project?
   6. What is a nuclear winter?

1. Atomic Bomb