In this study,an excellent polarization optical crystal LiNa_(5)Mo_(9)O_(30) with wide transmission range and high laser damage threshold was researched in detail.The laser damage threshold of the LiNa_(5)Mo_(9)O_(30) crystal was measured to be 2.64GW/cm^(2),which was the highest among polarized optical crystals.The birefringence in the range of 0.435-5μm was larger than 0.14,while the wedge angle between 31.94°and 32.12°would satisfy the application in this waveband.The extinction ratio of the fabricated prism with the wedge angel of 31.09°was larger than 15,000:1.The results show that the LiNa_(5)Mo_(9)O_(30) prism is an excellent polarization device,especially in the mid-infrared range and high-power applications.
Xiaoli DuZeliang GaoLijuan ChenYouxuan SunXutang Tao
新型无机二阶非线性光学晶体材料在光电子领域(如频率变换、光调制、通信和信息处理等领域)有着重要的应用,是材料研究的前沿方向之一。1998年以来,人们利用易于发生二阶姜-泰勒效应的离子———d0过渡金属离子(e.g.Mo6+,W6+,V5+,Nb5+)和含有非成键孤对电子(stereochemically active lone pair,SCALP,e.g.I5+,Te4+,Se4+,Sn2+)的阳离子,合成了大量具有非中心对称结构(NCS)的化合物,其中许多显示出很强的倍频效应(>400×α-SiO2),它们是一类有应用前景的非线性光学晶体材料。本文将这些材料分成三类进行综述,即:只含一类二阶姜-泰勒离子(d0或SCALP)的化合物;同时包含两类二阶姜-泰勒离子的化合物以及包含二阶姜-泰勒离子和其他非中心对称基团(共轭π-硼酸盐体系、PO4四面体和d10离子)的化合物。本文分别就新材料探索、单晶生长等综述了近10年来基于二阶姜-泰勒效应的非线性光学晶体材料的研究进展。
