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Electro‐optic, Piezoelectric and Dielectric Properties of Langasite (La 3 Ga 5 SiO 14 ), Langanite (La 3 Ga 5.5 Nb 0.5 O 14 ) and Langataite (La 3 Ga 5.5 Ta 0.5 O 14 )
Author(s) -
Stade J.,
Bohatý L.,
Hengst M.,
Heimann R.B.
Publication year - 2002
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200210)37:10<1113::aid-crat1113>3.0.co;2-e
Subject(s) - piezoelectricity , dielectric , materials science , condensed matter physics , composite material , physics , optoelectronics
Refractive indices were determined of single crystals of La 3 Ga 5 SiO 14 (langasite, LGS), La 3 Ga 5.5 Nb 0.5 O 14 (langanite, LGN) and La 3 Ga 5.5 Ta 0.5 O 14 (langataite, LGT) in the wavelength region between 0.36 μm and 2.33 μm. While phase‐matched optical second harmonic generation is not possible in LGS it occurs in the isotypic compounds LGN and LGT. Temperature‐dependent examination of the dielectric properties of LGS up to 600 °C showed anomalous behaviour. For all three substances the electro‐optic [ r σ ijk ] (“unclamped”) and the piezoelectric [ d ijk ] tensors were determined at room temperature. In addition, the temperature‐dependence of these properties was studied for LGS between –200 °C and +200 °C by a Jamin interferometer in combination with a modified Sénarmont compensator.