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Old 21st February 2011
  #23
Gear Addict
 

John,

That's simple at most basic breakdown

Phase grating uses reflective surfaces & distance (thus time, thus phase) through varied well-depths.

Amplitude grating uses reflection & absorption (so the return energy is a combination of those amplitudes). Slats over an absorber are a simple example of amplitude grating. A more scientific example would be the RPG BAD panel (binary amplitude diffusor).