Dichroic property of the H2O-groups in α-quartz, LiNbO3 and LiTaO3 in the infrared range |
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| Authors: | T.B. Wang S.L. Guo L. Chen L. Cao H. Li Z.G. Liu C.Z. Tan |
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| Affiliation: | aDepartment of Physics, Nanjing University of Information Science & Technology, 210044 Nanjing, China;bNational Laboratory of Solid State Microstructure, Department of Materials Science and Engineering, Nanjing University, 210093 Nanjing, China |
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| Abstract: | The absorptive peaks of the H2O-groups were observed in the infrared absorption spectra in the vicinity of 3480 cm−1 in LiNbO3 and LiTaO3, and 3580 cm−1 in α-quartz. The absorptions of these lines were found to depend on the vibration direction of the polarized incident light, showing the dichroic property in these crystals. The absorption of the ordinary ray waves is much larger than that for the E-ray waves in the crystals. This observation indicates that the direction of the bond vibrations for the H2O-groups is perpendicular to the optic axis of crystals. The dichroic property of the H2O-groups may serve as the tracer to study the local electric field in piezoelectric crystals. |
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| Keywords: | Optical materials Optical properties |
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