A 1mm thick flux-grown KTiOPO4 sample was poled with a 720nm domain period by employing deep-UV laser lithography, chemical patterning, and electric field poling. An atomic force microscope was used to characterize the periodic domain structure. The sample was used to demonstrate sixth and seventh order quasi-phase-matched backward second-harmonic generation.
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Canalias et al. (2005) studied this question.
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