Measurement of Refractive Index and Absorption Coefficient of Congruent and Stoichiometric Lithium Niobate in the Terahertz Range
| Autor: | János Hebling, László Pálfalvi, Márta Unferdorben, Ivett Hajdara, Zsuzsanna Szaller |
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| Rok vydání: | 2015 |
| Předmět: |
Radiation
Materials science Terahertz radiation business.industry Lithium niobate Analytical chemistry Photorefractive effect Condensed Matter Physics Polarization (waves) Spectral line Crystal chemistry.chemical_compound Optics chemistry Attenuation coefficient Electrical and Electronic Engineering business Instrumentation Refractive index |
| Zdroj: | Journal of Infrared, Millimeter, and Terahertz Waves. 36:1203-1209 |
| ISSN: | 1866-6906 1866-6892 |
| Popis: | Time domain THz spectroscopy measurements were performed on a series of undoped and Mg-doped congruent lithium niobate crystals with 1.2, 6.1, and 8.4 mol% Mg concentrations and on undoped and Mg-doped stoichiometric lithium niobate crystals with 0.7, 1.5, and 4.2 mol% Mg concentrations with polarization parallel (extraordinary) and perpendicular (ordinary) to the z axis of the crystal at 300 K. The absorption coefficient and refractive index spectra were determined in the THz frequency range from 0.25 to ~2.5 THz. In the case of congruent samples for both polarizations, both the refractive index and the absorption coefficient have minimal values for compositions close to the photorefractive threshold. In the case of stoichiometric samples, similar tendencies close to the photorefractive threshold at lower Mg concentration were observed but only for extraordinary polarization, while for ordinary polarization the measured values, especially for the absorption coefficient, were only weakly dependent on the Mg content. |
| Databáze: | OpenAIRE |
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