基于掺铒光纤激光器的光频梳研究
Research on Optical Frequency Comb Based on Erbium-Doped Fiber Laser

光纤激光器是二十世纪科学技术的一项重大成就，它具有低损耗、低功耗、结构简单、集成度高等优点。文章主要对基于掺铒光纤激光器的光频梳系统进行设计，搭建了全光纤结构的飞秒激光器，并且完成了光功率放大和重复频率锁定的实验研究。在实验中搭建的飞秒激光器的输出功率为0.63 mW，重复频率为90 MHz，光谱宽度为12.49 nm，通过放大器放大后光功率达到45 mW，光谱宽度展宽到42 nm，最后通过PID控制器，将激光器的重复频率锁定到稳定的参考信号源上，在0~1000 s记录时间内，记录数据的标准差为156 μHz。通过以上实验，文章不仅实现了对飞秒脉冲的光放大，还完成了对飞秒激光器重复频率的锁定，搭建出了一台可用于精密测量等领域的实用型飞秒光频梳。
Fiber laser is a major achievement of science and technology in the twentieth century. It has the advantages of low loss, low power consumption, simple structure and high integration. This article mainly designs an optical frequency comb system based on erbium-doped fiber laser, builds a femtosecond laser with all-fiber structure, and completes experimental research on optical power amplification and repetitive frequency locking. The output power of the femtosecond laser built in the experiment is 0.63 mW, the repetition frequency is 90 MHz, the spectral width is 12.49 nm, the optical power is amplified by the amplifier to 45 mW, and the spectral width is expanded to 42 nm. Finally, the PID controller is used to lock the repetition frequency of the laser to a stable reference signal source. The standard deviation of the recorded data is 156 μHz during the recording time from 0 to 1000 s. Through the above experiments, this paper not only realized the optical amplification of the femtosecond pulse, but also completed the lock of the repetition frequency of the femtosecond laser, and built a practical femtosecond optical frequency comb that can be used in precision measurement and other fields.