Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 3, Pages 375-377Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1775031
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The domain wall regions in periodically poled KTiOPO4 crystals were examined and found to give rise to phasematched second harmonic generation in the Cerenkov directions. This phenomenon is caused by the nonlinear coefficients d(11) and d(12), which are not present in single domain regions, but are nonzero at and close to domain walls. The appearance of these nonlinearities is attributed to strain, produced by the domain inversion process and results in the creation of a dc piezoelectric field. (C) 2004 American Institute of Physics.
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