Sha Hongyuan, Xiong Zheyao, Xu Junxin, Wang Zujian, Su Rongbing, He Chao, Yang Xiaoming, Long Xifa, Liu Ying
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350117, China.
ACS Appl Mater Interfaces. 2022 Mar 2;14(8):10588-10593. doi: 10.1021/acsami.1c25098. Epub 2022 Feb 16.
The phase matching ability is a key factor for nonlinear optical crystals to realize coherent output. Herein, a new design strategy combining ultraviolet and infrared functional groups into a ferroelectric was put forward. Thus, a phosphogermanate crystal, KGeOPO, was designed and studied. It exhibits a wide transparency window (0.22-9.70 μm), a strong second harmonic generation response (5× KHPO), a high laser-induced damage threshold (1.61 GW/cm), and the typical ferroelectricity (coercive field ∼ 9.8 kV/cm and remnant polarization ∼7.6 μC/cm). In the infrared region, it could realize coherent output by the birefringence phase matching method, while it could generate ultraviolet coherent lights by the quasi-phase matching technique. Therefore, this work designs a promising ultraviolet-infrared nonlinear optical crystal and provides a new perspective for exploring nonlinear optical crystals.
相位匹配能力是实现非线性光学晶体相干输出的关键因素。在此，提出了一种将紫外和红外官能团结合到铁电体中的新设计策略。因此，设计并研究了一种锗磷酸盐晶体KGeOPO。它具有宽透明窗口（0.22 - 9.70μm）、强二次谐波产生响应（5×KHPO）、高激光损伤阈值（1.61GW/cm）以及典型的铁电性（矫顽场～9.8kV/cm，剩余极化～7.6μC/cm）。在红外区域，它可以通过双折射相位匹配方法实现相干输出，而通过准相位匹配技术可以产生紫外相干光。因此，这项工作设计了一种有前景的紫外 - 红外非线性光学晶体，并为探索非线性光学晶体提供了新的视角。
