What is the meaning of co-propagating beam?

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SUMMARY

Co-propagating beams refer to two beams traveling in the same direction with identical wavevectors, while counter-propagating beams travel in opposite directions with wavevectors of opposite signs. This distinction is critical in fields such as optics and wave physics, where the interaction between beams can significantly affect outcomes. Understanding these concepts is essential for applications involving interference and wave interactions.

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cks
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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.
 
Science news on Phys.org
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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