Time-to-space control of optical signals in terahertz range using quasi-velocity-matched electro-optic spatial phase modulator

这项研究的目的是在电光晶体中利用简单的区域工程工艺来开发高速时空电光调制器。从理论上考虑了晶体中光群速度与微波相速度的失配，设计了行波电光相位调制器中的磁区反向区的形状，设计了光束截面内调制指数/调制位相的空间分布。1.超快行波电光偏转器及其在超短光脉冲产生中的应用；2.全光条纹相机；3.利用电光驻波位相光栅产生重复率为几十吉赫兹的亚皮秒光脉冲；4.基于超快偏转的光束时间轴反转；5.基于多级位相调制的连续光的电光透明频率转换。

The purpose of this study is to develop high speed time-space electro-optic modulators by use of simple domain-engineering processes in an electro-optic crystal. The shape of the domain inverted region in a traveling-wave electro-optic phase modulator is theoretically designed in consideration of velocity mismatch between an optical group velocity and a microwave phase velocity in a crystal for designed spatial distribution of the modulation index/modulation phase within an optical beam cross section.We have developed five new devices or functions ;1. Ultrafast traveling-wave electro-optic deflector and it application to ultra short optical pulse generation,2. All optical streak camera,3. Sub-picosecond optical pulse generation with repetition rate of several tens of gigahertz using electro-optic standing-wave phase grating,4. Inversion of the time axis of optical beam based on ultrafast deflection,5. Electrooptic transparent frequency conversion of a continuous-lightwave based on multistage phase modulation.