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Negative absorption coefficient

  1. Sep 11, 2015 #1
    The fact that energy in a laser can propagate without much loss over long distances is quite shocking !
    It's a renowned fact that energy is dissipated when propagation takes place through any medium.....
    (I'm fully aware that laser is an exception)
    But I have quite a difficult time understanding the concept of negative absorption.
    Is laser the only device that works on the principle or are there more?.??
     
  2. jcsd
  3. Sep 11, 2015 #2

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