钽铌酸钾晶体二次电光效应的应用研究进展

摘要

钽铌酸钾晶体(KTN)是目前已知的具有最大二次电光系数的晶体,利用其电光效应可改变光的相位、强度和传播方向,可广泛应用于光通讯、屏幕显示和生物医疗等领域.讨论了晶体组分、温度、缺陷和生长条纹对KTN晶体二次电光系数的影响；介绍了近几年国际上报道的几种基于KTN晶体二次电光效应的器件电光调制器、光开关、光束扫描器、变焦透镜和光谱仪,阐述了它们的的基本原理、研究现状和应用前景；对国内外KTN晶体电光器件研究的发展趋势进行了展望.%KTa1-xNbxO3(KTN) crystal exhibits an extremely large quadratic electro-optic effect, which can manipulate the phase, intensity and propagation direction of the light. KTN devices can be applied not only to optical communications, but also to various other fields that use optical beams, such as displays, medical use. The influence of Ta/Nb fraction, crystal temperature, inclusions and composition variation on the Kerr effect of KTN crystals is discussed in this paper. Several KTN devices based on the Kerr effect, including electro-optic modulator, optical switch, beam scanner, varifocal lens and spectrometer are introduced. The basic principle, research progress and application prospect of the devices are described. The trends in the research and development of the KTN devices is reviewed and predicted.