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One of the most intriguing aspects related to the χ(2) response of PBG crystals that still remains unresolved is the possibility of greatly enhancing the conversion efficiency of nonlinear processes. The enhancement of second harmonic generation (SHG) is perhaps the best example that we could cite. The processes that we discuss owe their increased efficiency to the simultaneous availability of: (1) exact phase matching conditions [1], and (2) high localization of the fields with frequencies tuned at transmission resonances near the photonic band edge.
© 2000 IEEE
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