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VOLUME 54 (1991) | ISSUE 10 | PAGE 562
Generation of reflected second harmonic and phase transition in ferroelectric thin films
Generation of the reflected second harmonic has been observed near the phase transition in ferroelectric thin films for the first time. A violation of fundamental polarization selection rules (a violation of the i6p, s prohibition") has been observed for the second harmonic in media with a small-scale inhomogeneity.