Raman spectroscopy and luminescence of Ho-doped lithium niobate crystals
| Autor: | Kokanyan, Ninel, Babajanyan, Naira, Movsesyan, Anush, Fontana, Marc, Kokanyan, Edvard |
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| Přispěvatelé: | Laboratoire Matériaux Optiques, Photonique et Systèmes (LMOPS), CentraleSupélec-Université de Lorraine (UL), Institute for Physical Research of National Academy of Sciences of Armenia (IPR NAS RA), National Academy of Sciences of the Republic of Armenia [Yerevan] (NAS RA), Kokanyan, Ninel |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Laser Physics-2018 Laser Physics-2018, Sep 2018, Ashtarak, Armenia |
| Popis: | International audience; Due to various excellent properties such as nonlinear optical, electro-optical,piezoelectric, photorefractive ones Lithium Niobate (LN) is one of the mostused ferroelectrics having a wide number of applications such as frequencydoubling, phase-conjugation, holographic storage, SAW sensors.Furthermore, the possibility of doping with rare-earth ions leads to laserapplications. Moreover, recently it has been shown that doping of LN with Ho3+impurity ions leads to the essential reduction of optical damage at 532nm.Raman spectroscopy is a important spectroscopic technique providing apossibility to investigate physico-chemical, structural as well as opticalproperties of materials under study. Polarized Raman measurements werecarried out on Ho-doped LN crystals with excitation wavelength of 532nm and785nm. For measurements with green light in obtained Raman anti-Stokesspectra expected modes were detected which obey the Raman selection rules.In a contrast, Raman Stokes spectra are significantly different with comparisonto what one expects according to selection rules. Well defined additionalforbidden lines appeared having quite high intensity. It should be noted, thatthe intensity of mentioned lines increases with an increase of Ho concentrationin the crystal. We attribute these to emission lines. So we can confirm that inthe same Stokes spectrum we were able with a good resolution to detect, thetransitions between the electronic states, and the vibrational states as well.Currently we present the analysis of these data as function of Ho content in thecrystal, for the cases with different polarization and wavelengths of the incidentlaser beam. |
| Databáze: | OpenAIRE |
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