Relationship between photorefractive activity and Raman scattering in lithium niobate crystals
| Autor: | Veronica Bermudez, E. Giulotto, Francesco Rossella, Riccardo DeContardi |
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| Přispěvatelé: | Giulotto, Enrico, De Contardi, Riccardo, Rossella, Francesco, Bermudez, V. |
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
business.industry
Chemistry Scattering Organic Chemistry Lithium niobate Physics::Optics Photorefractive effect Polarization (waves) Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Inorganic Chemistry symbols.namesake chemistry.chemical_compound Optics X-ray Raman scattering symbols Coherent anti-Stokes Raman spectroscopy Physics::Atomic Physics Electrical and Electronic Engineering Physical and Theoretical Chemistry business Raman spectroscopy Spectroscopy Raman scattering |
| Popis: | The paper reports on Raman scattering experiments in pure, Mg-doped and Fe-doped single crystals of lithium niobate. The measurements were carried out in 90degrees geometry at several laser beam intensities, and in several polarization arrangements. The possible occurrence of light-induced polarization-anisotropic scattering, and its effects on Raman spectra, were checked by simultaneously measuring the time dependence of the laser beam intensity transmitted by the sample with unchanged polarization, and the time dependence of the intensity of Raman lines from vibrational modes of known symmetry. The results give no indication of any effect of photorefractive activity on Raman observations in our pure and Mg-doped samples. On the contrary, in Fe-doped lithium niobate the build-up of light-induced o-e scattering strongly affected the relative intensities of Raman lines in specific experimental arrangements. We discuss the possible application of these effects to the characterization of lithium-niobate-based materials with strong photovoltaic and photorefractive activity. |
| Databáze: | OpenAIRE |
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