用于产生太赫超宽边带光谱的新型电／光调制器

报道了利用周期性的极转技术制作准速度匹配型电／光调制器，并以这种调制器产生超宽边带光谱的结果。电光晶体ＬｉＴａＯ３的极性分布周期的反转之后，在１６．２５ＧＨｚ的调制频率下，实现了微波与光波的准速度匹配，可以不局限于调制频率的高低，从而在增加相互作用长度的前提下充分提高调效率，调制度已达到５７ｒａｄ，产生的宽边带光谱的半值全宽为１．８５ＴＨｚ。     

A Novel Ultrahigh-Speed Electrooptic Lens with Periodic Domain Inversion

We report a novel electrooptic lens which is able to operate as a converging and a diverging lens alternately with ultrahigh-speed repetition. The quasi-velocity-matching with periodic domain inversion technique was incorporated in the proposed device to make it operate efficiently at a microwave frequency. The pattern of periodic domain inversion was analyzed theoretically to assure it was appropriate for the electrooptic lens. In the experiments, operation of the proposed electrooptic lens was demonstrated at 16.25 GHz.