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Fraunhofer diffraction is the light-spreading effect of an aperture when the aperture (or object) is lit by plane waves, i.e., waves that effectively come from a source that is infinitely far away.
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HUYGEN-FRESNEL PRINCIPLE
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THE PRINCIPLE OF BRAGG’S LAW
Sir William Lawrence Bragg in 1912 proposed a law that states that, diffraction occurs when electromagnetic radiation or subatomic particle waves with wavelength comparable to atomic spacing, are incident upon a crystalline sample, scattered by the atoms in the system and undergo constructive interference.
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3.Hologram (holos-whole:gram -message) can be imagined as a complicated diffraction grating. The recording of a hologram involves the mixing of a laser beam and the unfocused diffraction pattern of some object. In order to reconstruct an image of the object (holography is also known as wavefront reconstruction) an illuminating beam is diffracted by by plane surfaces surfaces within the hologram, following Bragg's Law, such that an observer can view the image with all of its three-dimensional detail.
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- http://skuld.bmsc.washington.edu/~merritt/bc530/bragg/
- http://www.microscopy.ethz.ch/bragg.htm
- http://www.tufts.edu/as/tampl/projects/micro_rs/theory.htm
- http://zomobo.net/diffracted
- http://science.jrank.org/pages/2063/Diffraction.html#ixzz2FDjBUAeX
- http://skuld.bmsc.washington.edu/~merritt/bc530/bragg/
- http://www.microscopy.ethz.ch/bragg.htm
- http://en.wikipedia.org/wiki/Huygens-Fresnel_principle