Optical Properties of Crystals of Lithium Niobate–Tantalate Solid Solutions LiNb $$_{{{\text{1}}-x}}$$ TaxO3

IF 0.6 4区材料科学 Q4 CRYSTALLOGRAPHY Crystallography Reports Pub Date : 2024-02-06 DOI:10.1134/s1063774523600874

E. V. Zabelina, A. A. Mololkin, N. S. Kozlova, V. M. Kasimova, R. R. Fakhrtdinov, V. E. Umylin, A. V. Sosunov

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Abstract

The growth system has been upgraded, technological growth parameters have been optimized, and a high-quality crystal has been grown from the LiNb_0.95Ta_0.05O₃ charge. Spectral dependences of the transmittance of a sample cut from this crystal have been measured before and after the transition to the single-domain state in the range of 300–700 nm with allowance for anisotropy and dichroism. Spectral dependences of the absorption coefficient α(λ) and degree of dichroism Δ(λ) have been obtained. The dependences α(λ) contain an absorption band at λ ~ 480 nm, regardless of the light propagation direction. When light propagates perpendicular to the optical axis, absorption bands at λ ~ 560, 608, 620, and 656 nm can additionally be observed. The transition to the single-domain state leads to sample bleaching. The dependences Δ(λ) for the X and Y cuts are characterized by identical extrema, whose positions correspond to the absorption bands in the dependences α(λ); additional extrema manifest themselves at λ ~ 400 and 445 nm. When light propagates along the optical axis, the dependences Δ(λ) are nonzero; they are characterized by much smaller values (in comparison with the directions perpendicular to the optical axis) and have extrema at λ ~ 440, 560, 600, 620, and 640 nm.

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铌酸锂-钽酸锂固溶体 LiNb $$_{{{\text{1}}-x}}$$ TaxO3 晶体的光学特性

摘要升级了生长系统，优化了技术生长参数，并从 LiNb0.95Ta0.05O3 电荷中生长出了高质量晶体。在 300-700 纳米范围内，测量了从该晶体切割出的样品在过渡到单畴态之前和之后的透射率光谱相关性，并考虑了各向异性和二色性。得到了吸收系数 α(λ) 和二色性程度 Δ(λ) 的光谱依赖关系。无论光的传播方向如何，α(λ) 的依存关系都包含一个位于 λ ~ 480 纳米的吸收带。当光线垂直于光轴传播时，还能观察到 λ ~ 560、608、620 和 656 纳米处的吸收带。向单域态的转变会导致样品漂白。X 切面和 Y 切面的依存关系 Δ(λ) 具有相同的极值，其位置与依存关系 α(λ) 中的吸收带相对应；在 λ ~ 400 和 445 纳米处会出现额外的极值。当光线沿光轴传播时，Δ(λ) 的相关性不为零；它们的特征是数值小得多（与垂直于光轴的方向相比），并且在 λ ~ 440、560、600、620 和 640 纳米处有极值。

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来源期刊

Crystallography Reports 化学-晶体学

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.