==> foryours.bbs@ptt.cc (最愛美嘉...^^) 提到:
> what is 相位匹配?
> 為什麼需要相位匹配?
> 不滿足相位匹配會如何?
> 這是我的問題,希望各位同學幫我解答
> 謝謝^^

  Phase matching is the k-space conservation which must be
  satisfied at the interface where the tranformation of two
  different electromagnetic waves occurs.

  For instance, while a light wave propagates (with a fixed k)
  in the forward direction of an optical fiber and meets a Bragg
  grating, a k-space conservation might exhibit between a forward mode (k),
  backward mode (-k), and the grating "K". If it happens, we say
  the phase matching condition is satisfied, and a corresponding
  light with a fixed -k will propagate in the backward direction of
  the optical fiber.


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