Wang Juan, Ge Siyu, Ren Hongfei, Huang Tao, Yang Peilong, Xu Peipeng, Bai Shengchuang, Dai Shixun, Du Jianke, Nie Qiuhua
Opt Lett. 2022 Jan 1;47(1):34-37. doi: 10.1364/OL.445042.
We demonstrate a thulium-doped mode-locked fiber laser with ultra-broadband wavelength tunability for micro-strain sensing based on the multimode interference (MMI) effect in single-mode-multimode-single-mode (SMS) fiber configuration. The homemade SMS device with high performance is fusion spliced in the laser cavity, and the developed dispersion precisely managed the all-fiber structured mode-locked picosecond laser with a record-breaking wavelength tuning range from 1976 to 1916 nm while exerting axial strain on this SMS device. We experimentally explored the regularity between the strain and the central-wavelength shift of the mode-locked pulse, and for the first time to the best of the authors' knowledge, achieved the precise in-line axial strain measurement from 0 to 5385 µɛ by using the tunable ultrafast-laser-based sensor, and sensitivity is up to -11.5 pm/µɛ. With high compactness and durability, this sensor has advantages in real-time dynamic measurement over other passive devices, thus will undoubtedly find various application scenarios.
我们展示了一种基于单模-多模-单模（SMS）光纤结构中的多模干涉（MMI）效应、具有超宽带波长可调性的掺铥锁模光纤激光器，用于微应变传感。将高性能的自制SMS器件熔接在激光腔内，所开发的色散精确控制了全光纤结构的锁模皮秒激光器，在对该SMS器件施加轴向应变时，其波长调谐范围达到了创纪录的1976至1916 nm。我们通过实验探索了应变与锁模脉冲中心波长偏移之间的规律，据作者所知首次利用基于可调谐超快激光的传感器实现了从0至5385 µɛ的精确在线轴向应变测量，灵敏度高达-11.5 pm/µɛ。该传感器具有高度紧凑性和耐用性，在实时动态测量方面优于其他无源器件，无疑将在各种应用场景中得到应用。
