Czochralski Growth and Characterization of Incongruent Melting LaxGdyScz(BO3)4 (x + y + z = 4) Nonlinear Optical Crystal

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• 作者：Lucian Gheorghe ; Federico Khaled ; Alexandru Achim ; Flavius Voicu ; Pascal Loiseau ; Gérard Aka
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：June 1, 2016
• 年：2016
• 卷：16
• 期：6
• 页码：3473-3479
• 全文大小：472K
• 年卷期：0
• ISSN：1528-7505

文摘

Incongruent melting nonlinear optical (NLO) crystals of La_xGd_ySc_z(BO₃)₄ (x + y + z = 4) - LGSB have been grown by the Czochralski method, for the first time to our knowledge. The crystal growth conditions are discussed, and the melt composition and growth parameters were optimized. The chemical composition of the best quality grown crystal was determined to be La_0.64Gd_0.41Sc_2.95(BO₃)₄. It crystallizes in the noncentrosymmetric space group R32 (Z = 3) with cell dimensions a = 9.794(4) Å and c = 7.961(6) Å. The transmission window and refractive indices were measured, and the phase-matching curves for type-I and type-II second harmonic generation and (ω + 2ω) sum frequency generation have been determined based on Sellmeier equations.