Srisamran Panuwat, Abughazaleh Ibrahim, Gerard Matthew D, Xu Duanyang, Jung Yongmin, Richardson David J, Xu Lin
Opt Express. 2025 Apr 21;33(8):16880-16888. doi: 10.1364/OE.559358.
We demonstrate a polarization-maintaining (PM), all-fiberized, mode-locked thulium-doped fiber laser, providing a dissipative soliton with nJ-level pulse energy. The laser has a figure-of-eight cavity with a nonlinear amplifying loop mirror (NALM) as a saturable absorber. A bridge-fiber splicing method is applied to incorporate a commercial PM dispersion compensating fiber for cavity dispersion management. A fiberized Lyot filter is implemented in the cavity using PM single-mode fibers to facilitate dissipative-soliton mode-locked operation. Single-pulse, mode-locked operation is realized at a repetition rate of 15.5 MHz with an output power of 23.8 mW, corresponding to a pulse energy of 1.5 nJ. The output spectrum has a central wavelength of 1860 nm with a 3-dB bandwidth of 18.6 nm. The output pulses have a duration of 7 ps and can be compressed down to 539 fs using an external grating-pair compressor. The all-PM mode-locked thulium fiber laser is environmentally insensitive and shows good power stability, and offers great potential for use as a reliable laser source for biomedical imaging applications.
我们展示了一种保偏（PM）、全光纤化、锁模掺铥光纤激光器，它能产生具有纳焦级脉冲能量的耗散孤子。该激光器采用八边形腔，其中非线性放大环镜（NALM）作为可饱和吸收体。应用桥接光纤熔接方法，纳入商用保偏色散补偿光纤进行腔色散管理。在腔内使用保偏单模光纤实现了光纤型利奥特滤波器，以促进耗散孤子锁模运转。在重复频率为15.5MHz时实现了单脉冲锁模运转，输出功率为23.8mW，对应脉冲能量为1.5nJ。输出光谱的中心波长为1860nm，3dB带宽为18.6nm。输出脉冲的持续时间为7ps，使用外部光栅对压缩器可将其压缩至539fs。全保偏锁模掺铥光纤激光器对环境不敏感，具有良好的功率稳定性，作为生物医学成像应用的可靠激光源具有巨大潜力。
