What is the meaning of co-propagating beam?

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

which means two beams that are traveling opposite to each other.
 
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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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