Reference beam

This is a forum to share experiences and ideas about holography.
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agentas

Reference beam

Post by agentas »

Why reference laser beam has to be with a angle the same as it was recording the hologram.Why in order to see transmission hologram this angle has to be the same as incidence,I do not find any explanation in books about this phenomena
Tom B.

Reference beam

Post by Tom B. »

No, the reconstruction angle can be different, it's just that as you get further from the original angle you get some geometric distortion and the angular range for best viewing changes. Perfect reconstruction of the original wavefront requires the same angle and wavelength, but for display holography you can get away with some pretty gross errors.
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