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| 全保偏飞秒光纤激光器异步锁定技术研究 |
| Study on asynchronous locking technology of femtosecond fiber laser with full deflection maintaining |
| 投稿时间：2023-03-03 |
| DOI：10.3969/j.issn.1005-5630.202303030034 |
| 中文关键词: 双光梳 掺铒光纤激光器 锁相环 重复频率锁定 |
| 英文关键词:dual-comb erbium-doped fiber laser phase-locked loop repetition frequency locking |
| 基金项目:国家重大科研仪器研制项目（11727812） |
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| 中文摘要: |
| 基于全保偏掺铒光纤激光器、锁相环系统和太赫兹测距光路搭建了一套太赫兹双光梳测距系统。所采用的全保偏掺铒光纤激光器重复频率为79.261 MHz。利用压电陶瓷(piezoelectric ceramics, PZT)和步进电机(stepper motor, SM)双级反馈控制的方案，实现了重复频率锁定和重复频率1.54 MHz可调。使用频率计数器对双光梳重复频率锁定效果进行监测，重复频率锁定的峰峰值抖动为±1.5 mHz，抖动标准差为0.4 mHz。将双光梳重频差设置在10 Hz，10 min内重复频率差最大抖动为3 mHz，标准差为0.6 mHz。进一步将异步采样双光梳系统应用于太赫兹测距，测量移动距离的误差为3 μm。该系统具有锁定精度高，稳定性强等优势，有望应用于生物无损检测和工业精密加工中。 |
| 英文摘要: |
| In this paper, a terahertz dual-comb ranging system is constructed based on a fully bias-maintaining erbium-doped fiber laser, phase-locked loop system and terahertz ranging optical path. In the experiment, the full bias-maintaining erbium-doped fiber laser had a repetition frequency of 79.261 MHz, and the repetition frequency was locked and the frequency was adjustable at 1.54 MHz by piezoelectric ceramic (PZT) and stepper motor (SM) dual-stage feedback control scheme. The peak-peak jitter and standard deviation of jitter were ±1.5 mHz and 0.4 mHz respectively. The repetition frequency difference of the dual-comb was set at 10 Hz, and the maximum jitter and standard deviation of repetition frequency difference within 10 min were calculated to be 3 mHz and 0.6 mHz. Furthermore, the asynchronous sampling dual-comb system was applied to the terahertz ranging, and the error of measuring the moving distance was 3 μm. The system has the advantages of high locking precision and strong stability, and is expected to be used in biological nondestructive testing and industrial precision machining. |
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