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  • phase matching

The technique used in a multiwave nonlinear optical process to enhance the distance over which the coherent transfer of energy between the waves is possible. In frequency doubling, the process is most efficient when the fundamental and the second harmonic phase velocities are matched. A three-wave process is phase-matched when K1 + K2 = K3 . K1 is the wave vector of the ith wave participating in the interaction.
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