Optical absorption and interband faraday rotation in litao3 and linbo3

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Abstract
The optical absorption and the interband Faraday rotation in LiTaO3 and LiNbO3 were measured at room temperature. The optical absorption in both crystals follows Urbach's equation and the effective temperatures defined by this equation are considerably higher than those of the cubic perovskites. The interband Faraday rotations are negative and about one order of magnitude smaller than those of the perovskites. The results are well described by a combination of indirect transition and direct transition which is estimated from the absorption data.

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