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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。
A new type of fiber laser - QDFL (quantum dot laser) is proposed. In QDFL, the QDFL was simulated by using the PbSe quantum dots as the active medium of the laser, taking advantage of the large emission cross section of PbSe quantum dots. The laser power and saturation length of PbSe quantum dot fiber laser are numerically calculated and the influence of different output mirror reflectivity on laser power is given. The results show that the output power of QDFL is higher, the gain coefficient is bigger and the length of fiber is shorter than the traditional Yb-doped fiber laser. The laser power of QDFL is closely related to the fiber length, and the saturation power has nothing to do with the doping concentration. Changing the reflectivity of the cavity exit mirror can change the laser power. These results need to be verified and tested.