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What is the meaning of co-propagating beam?

  1. Apr 7, 2009 #1

    cks

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    I want to ask, is counter propagating beam written as co-propagating beam?

    which means two beams that are travelling opposite to each other.
     
  2. jcsd
  3. Apr 7, 2009 #2

    Andy Resnick

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    counter propagating and co-propagating beams generally mean they have the same wavevector: for counterpropagating beams the wavevector has opposite sign, for copropagating, the same sign.
     
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