双折射
二次谐波产生
共轭体系
材料科学
Crystal(编程语言)
带隙
光电子学
离子键合
波长
晶体结构
结晶学
光学
离子
化学
聚合物
物理
有机化学
激光器
计算机科学
复合材料
程序设计语言
作者
Zhihui Yang,Nan He,Zheshuai Lin,Xiaoying Shang,Xueyuan Chen,Yanqiang Li,Weiqi Huang,Maochun Hong,Sangen Zhao,Junhua Luo
出处
期刊:Small
[Wiley]
日期:2023-09-08
标识
DOI:10.1002/smll.202305473
摘要
Abstract Traditional nonlinear optical (NLO) crystals are exclusively limited to ionic crystals with π ‐conjugated groups and it is a great challenge to achieve a subtle balance between second‐harmonic generation, bandgap, and birefringence for them, especially in the deep‐UV spectrum region ( E g > 6.20 eV). Herein, a non‐ π ‐conjugated molecular crystal, NH 3 BH 3 , which realizes such balance with a large second‐harmonic generation response (2.0 × KH 2 PO 4 at 1064 nm, and 0.45 × β ‐BaB 2 O 4 at 532 nm), deep‐UV transparency ( E g > 6.53 eV), and moderate birefringence (Δ n = 0.056@550 nm) is reported. As a result, NH 3 BH 3 exhibits a large quality factor of 0.32, which is evidently larger than those of non‐ π ‐conjugated sulfate and phosphate ionic crystals. Using an unpolished NH 3 BH 3 crystal, effective second‐harmonic generation outputs are observed at different wavelengths. These attributes indicate that NH 3 BH 3 is a promising candidate for deep‐UV NLO applications. This work opens up a new door for developing high‐performance deep‐UV NLO crystals.
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