6.10 Non-Linear Optics and SHG
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= 2 f = 2 c / (/n) = 2 c n /
n () n (2)
S , S , S are generated only if v = v . (in-phase, n() = n(2).)
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When S , S , S have matched phases, intensity of 2 could be built.
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At specific in birefringence material, index matching when n () = n (2).
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