PbSe量子点光纤激光器的数值模拟

Numerical simulation of PbSe quantum-dot-doped fiber laser

提出了一种新型的光纤激光器——掺量子点的光纤激光器(QDFL)。在QDFL中,利用PbSe量子点具有大发射截面的特点,将PbSe量子点作为激光器的激活介质,对QDFL进行了计算机数值模拟。数值计算了掺PbSe量子点光纤激光器的激光功率及饱和长度,并给出了不同输出镜反射率对激光功率的影响。结果表明:与传统的掺镱离子的光纤激光器相比,QDFL的输出激光功率更高,增益系数更大,光纤的饱和长度较短。QDFL的激光功率与光纤长度密切相关,饱和功率与掺杂浓度无关。改变谐振腔出射镜的反射率,可以改变激光功率。这些结果有待于实验的证实和检验。

Quantum dots（QDs） is one of the research hotspot of new materials in recent years.A novel quantum-dot-doped fiber laser（QDFL） was presented in this paper.In the QDFL,PbSe QDs was used as a lasing active medium that had a bigger emission cross-section than that of the ytterbium ion available.The output power and the fiber saturated length of the PbSe QDFL were numerically simulated,and effects of different output-mirror reflectivities on the laser power were investigated.Compared with usual ytterbium-doped fiber lasers,the simulated QDFL has desirable performance of larger output power,higher gain coefficient and shorter saturated fiber length.The laser power of QDFL depends on the fiber length,the doped concentration and the output-mirror reflectivity,while its saturated power is independent on the doped concentration.Changing the output-mirror reflectivity can change laser power.The possible performance of QDFL needs further research and verification in experiments in the future.