Re: [問題] 電磁問題-甚麼是相位匹配(Phase matching)?
==> 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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