研究了Nd∶YVO4固体皮秒振荡器与掺铒光纤锁模振荡器的脉冲同步技术,为光参量放大、中红外产生等应用奠定了实验基础。实验采用光电二极管分别探测一台商售1064 nm Nd∶YVO4固体皮秒振荡器和一台自制1555 nm掺铒光纤锁模振荡器的脉冲重复频率,通过混频、低通滤波等电路处理得到了两台激光器重复频率的相对误差,并将该误差信号反馈至内置于1555 nm掺铒光纤锁模振荡器中用于精调腔长的压电陶瓷和粗调腔长的步进电机上,实现了两台激光器重复频率的同步。本实验中的同步装置具有结构简单、集成度高、可靠性高的特点。

Herein, the pulse synchronization between Nd∶YVO4 picosecond and Er-doped fiber mode-locked oscillators was examined, which is the basis for both optical parametric amplification and generation of mid-infrared. In the experiment, the repetition rates of 1555-nm Er-doped fiber mode-locked oscillator and 1064-nm Nd∶YVO4 picosecond oscillator were detected by a photodiode. The timing delay between the two lasers was detected using a frequency mixing and low-pass filter circuit. The repetition rates of two lasers were synchronized by controlling the piezoelectric transducer and stepper motor in the Er-doped fiber mode-locked oscillator. The proposed configuration exhibits advantages of simple structure, high integration and reliability.