用高温熔融二次热处理法,制备了钠铝硼硅酸盐PbSe量子点玻璃及量子点光纤。光纤中量子点的尺寸为4.73 nm±0.25 nm,吸收和辐射峰分别位于1450 nm和1500 nm。测量了量子点光纤的吸收谱、光致荧光(PL)光谱、PL峰值光强随抽运功率的变化,以及980 nm抽运功率在光纤中的衰减系数、PL峰值光强和PL峰值波长随光纤长度的变化。确定了量子点光纤随波长变化的衰减系数、抽运激励阈值功率和饱和功率。从能级跃迁、表面效应等方面解释了实验现象。

The sodium-aluminium borosilicate glass and quantum-dot (QD)-doped fiber are fabricated by the two-step high temperature annealing method. The QDs within the fiber have a size of 4.73 nm±0.25 nm and their absorption and emission peaks are at 1450 nm and 1500 nm, respectively. The absorption spectra, photoluminescence (PL) spectra and PL peak intensity versus pumping power are measured. The attenuation coefficient within the fiber at 980 nm pumping power and PL peak intensity and peak wavelength versus fiber length are also measured. The wavelength-dependent attenuation coefficient, pumping excitation threshold and saturation power in the QD-doped fiber are determined. The experimental phenomena is explained from the aspects of energy-level transition, surface effects, and so on.