共价键
二次谐波产生
材料科学
紫外线
铍
光化学
化学
激光器
光电子学
光学
有机化学
物理
作者
Chao Wu,Xingxing Jiang,Lin Lin,Wenyan Dan,Zheshuai Lin,Zhipeng Huang,Mark G. Humphrey,Chi Zhang
标识
DOI:10.1002/ange.202113397
摘要
Abstract Deep‐ultraviolet (deep‐UV) nonlinear optical (NLO) crystals are key materials in creating tunable deep‐UV lasers for frequency conversion technology. However, practical application of the sole usable crystal, KBe 2 BO 3 F 2 , has been hindered by the high toxicity of beryllium and its layering tendency in crystal growth. Herein, we report a beryllium‐free deep‐UV NLO material NaSr 3 (OH)(B 9 O 16 )[B(OH) 4 ] (NSBOH), synthesized by a covalent bond modification strategy under hydrothermal conditions. Moisture‐stable NSBOH exhibits strong second‐harmonic generation (SHG) at 1064 nm (3.3 × KH 2 PO 4 ) and 532 nm (0.55 × β‐BaB 2 O 4 ), both amongst the largest powder SHG responses for a deep‐UV borate, with good phase‐matchability and a short wavelength cutoff edge (below 190 nm). NSBOH possesses a 3D covalent anionic [B 9 O 19 ] ∞ honeycomb‐like framework with no layering. The Sr 2+ and Na + ions, residing in the cavities of the anionic framework, act as templates for the assembly and favorable alignment of NLO‐active groups, resulting in an optimal balance between strong SHG activities and wide UV transparency. These merits indicate NSBOH is a very attractive candidate for deep‐UV NLO applications.
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