期刊
SOLID STATE COMMUNICATIONS
卷 123, 期 8, 页码 339-341出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-1098(02)00324-1
关键词
ferroelectrics; crystal structure and symmetry; optical properties; phase transitions; nonlinear optics
The temperature dependence of optical second-harmonic generation in TlInS2 crystals in the vicinity of phase transitions has been investigated. It is established that in an incommensurate phase the generation is observed only for propagation of the fundamental wave along the superstructure axis and its existence for certain experimental configurations confirms C-2(3) space group of the low-temperature polar phase. The dependence of the spectra on thermocycling process is explained by the formation and the annihilation of the incommensurate-like structures inside the commensurate phase. (C) 2002 Elsevier Science Ltd. All rights reserved.
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