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根据实验制备的钠硼铝硅酸盐PbSe量子点玻璃及其透射电子显微镜(TEM)图、吸收谱和发射谱,计算机数值模拟了以PbSe量子点作为激活增益介质的红外单模光纤激光。应用遗传算法,通过数值求解粒子数速率方程和激光谐振腔振荡方程,优化计算了量子点光纤激光器(QDFL)的最佳抽运波长、光纤长度、掺杂浓度及出射镜反射率。结果表明:饱和抽运功率为2 W,在1676nm激光波长处,QDFL最大输出功率可达1.36 W,抽运效率达68%。与通常的掺稀土离子(Yb3+、Er3+)的光纤激光器相比,QDFL具有抽运效率高、激励阈值低、掺杂密度可调、光纤饱和长度短等特点。由于量子点辐射波长的尺寸依赖特性,容易形成多波长激射或波长可调的新型激光器。
According to the prepared PbSe quantum dot glass of sodium boroaluminosilicate and its transmission electron microscope (TEM), absorption spectrum and emission spectrum, the infrared single-mode fiber laser with PbSe quantum dot as the activation gain medium was simulated by computer. The optimal pumping wavelength, fiber length, doping concentration and reflector reflectivity of quantum dot fiber laser (QDFL) are optimized by using the genetic algorithm to solve the particle number velocity equation and the laser cavity oscillation equation numerically. The results show that the maximum pumping power of QDFL can reach 1.36 W and the pumping efficiency reaches 68% at a laser wavelength of 1676 nm. Compared with the conventional rare earth doped (Yb3 +, Er3 +) fiber lasers, QDFL has the advantages of high pumping efficiency, low excitation threshold, adjustable doping density and short fiber saturation length. Due to the size dependence of the wavelength of the quantum dots, new lasers with multi-wavelength lasing or tunable wavelength are easy to form.