以PbSe量子点作为激活增益介质,在由量子点掺杂光纤、波分复用器、光纤光栅等组成的全光纤环形谐振腔中,实验首次观测到了波长为1550nm、稳定连续的激光振荡。在980nm激光二极管(LD)抽运下,发现了明显的抽运激励阈值。低于激励阈值时,没有激光;高于激励阈值时,激光输出功率随激励功率线性增大。激光输出为多模,通过光纤弯绕方式可选出单模输出。对于50μm纤芯直径的多模量子点光纤,当入纤抽运功率为68mW时,实测激光输出功率为19.2mW(多模)和6.31mW(单模),激光的3dB线宽小于0.1nm,抽运效率分别为28%和9.3%。 Taking PbSe quantum dots as the activation gain medium, a stable and continuous laser oscillation was first observed in all-fiber ring resonator composed of quantum dot doped fiber, wavelength division multiplexer, fiber grating and so on. Under 980 nm laser diode (LD) pumping, a significant pumping excitation threshold was found. Below the excitation threshold, there is no laser; above the excitation threshold, the laser output increases linearly with the excitation power. The laser output is multimode, single-mode output can be selected by way of fiber bend. For the 50μm core diameter multimode quantum dot fiber, the measured laser output power is 19.2mW (multi mode) and 6.31mW (single mode) when the fiber pumping power is 68mW. The 3dB linewidth of the laser is less than 0.1nm , Pumping efficiency were 28% and 9.3%.