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Old Aug 27th 2015, 07:39 AM   #1
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How holography works

To make a hologram a film is exposed to an incident plane wave and wave from the object to record the interference pattern on the film. The principle is commonly explained in a way like that in p.1212 of "University Physics" ( https://books.google.com.hk/books?id...&lpg=PA1211&dq )

What I don't understand is why a 3D image can be made by shining a plane wave through the film. The film is grating so at some points constructive interference can produce the point representing the object. But why the overall wave is diverged (show in 36.29b, p.1212) ?
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Old Aug 30th 2015, 01:28 PM   #2
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If you look at it in terms of reproducing the original wave front, then the interference between the reference wave and the object wave is saved on the film. Later the film is illuminated with the same reference wave to reproduce the original object wave front.

I couldn't open you links.
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