对超短光脉冲的滤波一直是一个难以解决的问题,一般的光学器件很难分辨皮秒级光脉冲。基 于时间透镜技术研究了一种面向超短光脉冲的滤波系统。光脉冲通过一个由标准单模光纤(SSMF)和时间 透镜组成的傅里叶变换系统,经傅里叶变换后通过光开关进行截取,截取后的光脉冲再次经过一个 由时间透镜和SSMF组成的反傅里叶变换系统,得到滤波后的波形,实验结果表明其时间分辨 率达到皮秒级。所提方法采用全光系统,结构简单,实时性好。

The filtering of ultra-short optical pulse is always a conundrum, and it is difficult for ordinary optical devices to distinguish the picosecond level optical pulses. Based on time lens technology, a filtering system for ultra-short optical pulses is developed. An optical pulse passes through a Fourier transform system which is composed of standard single mode fiber(SSMF) and time lens, and it’s intercepted by an optical switch after Fourier transformation. The truncated pulse passes through an inverse Fourier transformation system composed of time lens and SSMF again, and the filtered waveform is obtained. The experimental results show that the time resolution reaches the picosecond level. The proposed method adopts an all-optical system with simple structure and good real-time performance.