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Holography

Holography. Group D 蘇郁倫、 楊士鋒 、 葉嘉儀 、徐士璿. Outline. Introduction Making a Hologram Production Application Reference. Introduction. What’s holography?. From escalator of MRT CKS memorial hall station. Introduction. A method of obtaining three- dimensional photographic

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Holography

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  1. Holography Group D 蘇郁倫、楊士鋒、葉嘉儀、徐士璿

  2. Outline • Introduction • Making a Hologram • Production • Application • Reference

  3. Introduction • What’s holography? From escalator of MRT CKS memorial hall station.

  4. Introduction • A method of obtaining three- dimensional photographic images. These images are obtained without a lens, so the method is also called lensless photography. The records are called holograms. • Developed by the British physicist Dennis Gabor in 1947. British physicist Dennis Gabor won the Nobel Prize in physics in 1971.

  5. Making a hologram

  6. Making a hologram • Exposing a film to laser light which is scattered by the object being holographed and light coming directly from the laser. • The film simply records the interference pattern, which is the hologram. • To view the image, the hologram is illuminated by light, which is diffracted by the interference pattern. Thus reproducing the original surface pattern of the object in three dimensions.

  7. Production • 3 attributes of light: - intensity、color、direction • Not only the intensity distribution of reflected light is recorded but also the phase distribution. - coherent reference beam interfere with the reflected waves. • Viewed from different angles, the object is also seen from different angles.

  8. Application • Optical microscopy for organisms. • The most important application is in interferometer. • 3D picture. • The storage of digital data. - a large number of “pages” can be recorded in one hologram.

  9. Application • In interferometer: - If one constructs two holograms of the same object on the same plate and the object underwent a deformation between the two recordings, then upon reconstruction the two holographic images, phase differences in certain parts of the two images will result, shows the deformation clearly. This method is extremely sensitive for deformation studies.

  10. Application • 3D picture:

  11. Reference • Holography http://www.pida.org.tw/Holography.html • The history of holography http://inventors.about.com/library/ inventors/blholography.htm/

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