We demonstrate a high-energy noise-like pulse (NLP) generated by an Er-doped fiber (EDF) laser incorporating a PbS quantum dot (QD) polystyrene (PS) composite film as a saturable absorber (SA). Benefitting from the intrinsic properties of NLPs and the high damage threshold of the PbS QD PS composite film, a stable NLP train can be obtained with an output power of 96.3 mW at a pump power of 660 mW, corresponding to a pulse energy of 9.68 nJ. This represents the highest pulse energy ever reported in an NLP EDF laser incorporating material-based SAs. The slope efficiency reached 17.37% and the steady NLP operation was able to be maintained for several hours under laboratory conditions. Our experimental results prove that the PbS QD PS composite film can serve as an effective SA to realize high-energy pulses in a mode-locked fiber laser.

我们展示了由掺铒光纤 (EDF) 激光器产生的高能类噪声脉冲 (NLP)，该激光器包含 PbS 量子点 (QD) 聚苯乙烯 (PS) 复合膜作为可饱和吸收体 (SA)。受益于 NLP 的固有特性和 PbS QD PS 复合膜的高损伤阈值，在 660 mW 的泵浦功率下，输出功率为 96.3 mW，对应的脉冲能量为 9.68 nJ，可以获得稳定的 NLP 序列. 这代表了 NLP EDF 激光器中包含基于材料的 SA 的最高脉冲能量。斜率效率达到 17.37%，在实验室条件下，NLP 的稳定运行能够维持数小时。我们的实验结果证明，PbS QD PS 复合薄膜可以作为一种有效的 SA，在锁模光纤激光器中实现高能脉冲。