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10
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vol 62 / November, 2019
Article

DOI 10.17586/0021-3454-2019-62-3-256-260

UDC 535.41

USING THE LASER CONОSCOPY METHOD FOR THE ANALYSIS AND EVALUATION OF OPTICAL QUALITY OF LITHIUM NIOBATE CRYSTALS

O. Y. Pikoul
Far Eastern State Transportation University, Department of Physics, Khabarovsk;


N. V. Sidorov
I. V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Science Center of the RAS, Laboratory of Materials for Electronic Engineering, Sector of Vibrational Spectroscopy and Structural Studies; Head of the Sector ;


M. N. Palatnikov
Dr. Sci.; I. V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Science Center of the RAS, Laboratory of Materials for Electronic Engineering, Sector of Solid-State Materials of Acoustic and Optoelectronics; Head of the Sector;


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Abstract. Results obtained by the conoscopic method in the study of LiNbO3: Zn crystals with a low photore-fraction effect in the concentration range of 4.46—7.5 mol. % ZnO are presented. Analysis of full-scale conoscopic patterns in the polarized laser radiation confirms the abrupt (threshold) nature of the effect of zinc on the optical properties of single crystals when the concentration changes. The maximum value of anomalous biaxiality angle of 2V = 24' and anomalous birefringence Δn = 0.557•10-5 are recorded for a sample of LiNbO3: Zn with concentration of 7.5 mol. %.
Keywords: conoscopic pattern, lithium niobate, optical homogeneity, optical anomalies, alloying

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