Linear and nonlinear optical properties of Na₃La₂(BO₃)₃ crystal

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• 作者：Kai Li ; Guochun Zhang ; Shu Guo ; Xin Zhang ; Ran He ; Jianxiu Zhang ; Zheshuai Lin ; Yicheng Wu
• 关键词：Top-seeded solution growth ; Refractive index ; NLO coefficient
• 刊名：Optics and Laser Technology
• 出版年：2013
• 出版时间：30 December, 2013
• 年：2013
• 卷：54
• 期：Complete
• 页码：407-412
• 全文大小：2222 K

文摘

A 30¡Á20¡Á8 mm³ Na₃La₂(BO₃)₃ crystal has been grown by the top-seeded solution growth method (TSSG) using Na₂O-B₂O₃-NaF as flux. The refractive indices at thirteen wavelengths from 0.2537 to 2.325 ¦Ìm were accurately measured by the minimum deviation method, and the Sellmeier equations were accordingly constructed. The nonlinear optical (NLO) coefficients were measured by the Maker fringe method, which gave results of d₃₁=1.45 pm/V, d₃₂=0.67 pm/V, and d₃₃=?1.06 pm/V, respectively. For second-harmonic generation (SHG) of 1064 nm, the effective NLO coefficient (d_eff) of type I phase-matching reaches the maximum value (1.44 pm/V) at the phase-matching angles ¦È=77.0¡ã, ?=212.1¡ã, which is larger than that of LiB₃O₅ (LBO). First-principle calculations suggest that Na₃La₂(BO₃)₃ possesses two types of NLO-active atom groups, BO₃ group with ¦Ð-orbital system and La-centered polyhedron with large polar displacement, of which the latter could be considered as a new type of NLO-active atom group.