Opt Express. 2023 Apr 10;31(8):12837-12846. doi: 10.1364/OE.485613.
We demonstrate for the first time a strain-controlled all polarization-maintaining (PM) fiber Lyot filter based on a piezoelectric lead zirconate titanate (PZT) fiber stretcher. This filter is implemented in an all-PM mode-locked fiber laser to serve as a novel wavelength-tuning mechanism for fast wavelength sweeping. The center wavelength of the output laser can be tuned across a range from 1540 nm to 1567 nm linearly. And the strain sensitivity achieved in the proposed all-PM fiber Lyot filter is 0.052nm/με, which is 43 times higher than that achievable by other strain-controlled filters such as a fiber Bragg grating filter (0.0012nm/με). Wavelength-swept rates up to 500 Hz and wavelength tuning speeds up to 13,000 nm/s are demonstrated, which is hundreds of times faster than what is attainable with conventional sub-picosecond mode-locked lasers based on mechanical tuning methods. This highly repeatable and swift wavelength-tunable all-PM fiber mode-locked laser is a promising source for applications requiring fast wavelength tunability, such as coherent Raman microscopy.
我们首次展示了一种基于压电锆钛酸铅（PZT）光纤拉伸器的应变控制全偏振保持（PM）光纤 Lyot 滤波器。该滤波器在全 PM 锁模光纤激光器中实现，用作快速波长扫描的新型波长调谐机制。输出激光的中心波长可以线性调谐到 1540nm 至 1567nm 的范围。并且在提出的全 PM 光纤 Lyot 滤波器中实现的应变灵敏度为 0.052nm/με，比其他应变控制滤波器（例如光纤布拉格光栅滤波器（0.0012nm/με））高 43 倍。演示了高达 500Hz 的波长扫描速率和高达 13000nm/s 的波长调谐速度，这比基于机械调谐方法的传统皮秒级锁模激光器快数百倍。这种高度可重复且快速的波长可调谐全 PM 光纤锁模激光器是需要快速波长可调谐性的应用（如相干拉曼显微镜）的有前途的光源。
