Optical properties of double doped LiNbO3:Gd:Mg crystals
N.A. Teplyakova, N.V. Sidorov, M.N. Palatnikov
Tananaev Institute of Chemistry Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
DOI: 10.26456/pcascnn/2023.15.207
Short communication
Abstract: By direct alloying of congruent melt with magnesium and gadolinium oxides, compositionally uniform nonlinear optical single double doped crystals with different content of dopants have been grown: LiNbO3:Gd3+(0,003):Mg2+(0,65 wt. %), LiNbO3:Gd3+(0,23):Mg2+ (0,75 wt. %) and LiNbO3:Gd3+(0,25):Mg2+(0,75 wt. %). The results obtained by laser conoscopy and photoinduced light scattering indicate a high structural perfection of the grown crystals. The results give grounds to assert that LiNbO3:Gd:Mg crystals are close to a stoichiometric crystal in some of their properties. A low value of the coercive field (≈2,3 kV/cm) is one of such properties of stoichiometric and magnesium-doped LiNbO3 crystals, which are important for creating materials for laser radiation conversion on periodically polarized submicron-sized domains with flat boundaries. In this case, the grown LiNbO3:Gd:Mg crystals have a much higher optical uniformity than a stoichiometric crystal. Crystals of LiNbO3:Gd3+(0,003):Mg2+ (0,65 wt. %) and LiNbO3:Gd3+(0,23):Mg2+ (0,75 wt. %) have the highest optical uniformity and the absence of the photorefraction effect. Increase of gadolinium concentration to 0,25 wt. % leads to increased distortion of the conoscopic pattern and to the appearance of a significant photorefractive response of the LiNbO3:Gd3+(0,25):Mg2+(0,75 wt. %) crystal.
Keywords: lithium niobate, crystal, defects, laser conoscopy, photorefractive properties
- Natalya A. Teplyakova – Ph. D., Senior Researcher, Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
- Nikolay V. Sidorov – Dr. Sc., Professor, Chief Researcher and as Head of the Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
- Mikhail N. Palatnikov – Dr. Sc., Chief Researcher and as Head of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
Reference:
Teplyakova, N.A. Optical properties of double doped LiNbO3:Gd:Mg crystals / N.A. Teplyakova, N.V. Sidorov, M.N. Palatnikov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2023. — I. 15. — P. 207-214. DOI: 10.26456/pcascnn/2023.15.207. (In Russian).
Full article (in Russian): download PDF file
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