The refractive indices no and ne, the linear electrooptic coefficient r33, and the relative (low frequency) permittivities ε3 and ε2 = ε2 of nominally pure KTN crystals with tetragonal symmetry (4 mm) are measured at different temperatures. In the case of the optical properties (no, ne, and r33) the light wavelength is varied, too.
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Loheide et al. (1993) studied this question.
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