Thermo-physical properties of nonlinear optical crystal K₃B₆O₁₀Br

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• 作者：Mingjun Xia ; Bo Xu ; Lijuan Liu ; Xiaoyang Wang ; Rukang Li and Chuangtian Chen
• 关键词：K3B6O10Br ; nonlinear optical crystals ; temperature-dependent refractive indices ; thermo-physical properties
• 刊名：Journal of Applied Crystallography
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：49
• 期：2
• 页码：539-543
• 全文大小：465K
• ISSN：1600-5767

文摘

The thermo-physical properties of the nonlinear optical (NLO) crystal K₃B₆O₁₀Br (KBB) were experimentally investigated, including specific heat, thermal conductivity, coefficient of thermal expansion and refractive index. The specific heat of KBB is lower than that of LiB₃O₅ and higher than that of other borate NLO crystals, such as β-BaB₂O₄, CsLiB₆O₁₀ and CsB₃O₅, and KBB manifests a high damage threshold because of its lower temperature gradient during laser pulse irradiation. The thermal expansion coefficients were obtained as α_x = 5.09 × 10⁻⁶ K⁻¹ and α_z = 2.39 × 10⁻⁵ K⁻¹, showing weaker anisotropy than those of commonly used NLO crystals. The temperature-dependent Sellmeier dispersion equations of the refractive indices were also obtained, and the phase-matching angles for second harmonic generation (SHG) at temperatures of 313, 343, 373, 403 and 433 K which were calculated from these equations are in good agreement with the experimental values. All results are indicative of the KBB crystal as a novel promising NLO crystal for high power SHG.