基于钠硼铝硅酸盐玻璃的PbSe量子点红外单模光纤激光

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。

A Single-Mode Infrared Fiber Laser Based on Sodium-Boron-Aluminosilicate Glass Doped with PbSe Quantum Dots

A single mode infrared (IR) fiber laser using PbSe quantum dots as active medium is proposed according to the observed transmission electron microscope (TEM) images, absorption and emission spectra of the sodium-boron-aluminosilicate glass doped with PbSe quantum dots prepared before. The rate equations and lasing oscillation equation in a resonator are solved numerically. The optimal pumping wavelength, fiber length, doping concentration and reflectance of output mirror are obtained by using genetic algorithm. There is evidence that the quantum dots fiber laser (QDFL) possesses the saturated pumping power of 2 W, the maximum output of 1.36 W for 1676 nm lasing wavelength, and the pumping efficiency of 68%. Compared with the conventional fiber lasers that are doped with rare earth ions (e.g. Yb3+, Er3+), QDFL has characteristics of high pumping efficiency, low exciting threshold, adjustable doping density, and short saturated fiber length. The proposed QDFL can be developed into a novel multi-wavelength and wavelength-tunable laser due to lasing wavelength depending on the size of quantum dots.