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The ferroelectric phase transition in a single-domain KTiOPO4 (KTP) crystal is studied with optical second-harmonic generation. The optical nonlinearity decreases continuously with increasing temperature and vanishes at the Curie point (TC=952 °C) and above. Over a broad temperature range in the ferroelectric phase, the nonlinear optical coefficient d33∝(TC−T)0.5. This behavior is in good agreement with the Landau theory for second-order ferroelectric phase transitions.
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Chu et al. (1992) studied this question.
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