为了实现高效、全光纤化的2μm激光输出, 采用中心波长为1569nm附近的级联双包层铒镱共掺光纤放大器来抽运铥钬共掺单模光纤、1550nm/2000nm波分复用器、光纤耦合器构成的环形腔全光纤激光器。当915nm LD抽运驱动电流为6.9A时, 获得的最大输出激光功率为57.23mW, 斜率效率约为12%, 线宽约为4.5nm, 阈值抽运功率约为180mW。结果表明, 该光纤激光器性能可靠, 其在光纤传感、激光医疗等领域将有巨大应用前景。

To achieve efficient all fiber laser at 2μm, a Tm-Ho co-doped single mode fiber was pumped by a dual double-cladding Er-Yb co-doped fiber amplifier. An all fiber ring laser was formed with a 1550nm/2000nm wavelength-division multiplexier and a fiber coupler. When the drive current of 915nm LD was 6.9A, the maximum laser output power was about 57.23mW, the slope efficiency was measured to be about 12% with the linewidth of 4.5nm, the threshold pump power was about 180mW. The experimental results demonstrate that the laser shows high performance and it is prospective in fields of optical fiber sensing and laser medical treatment.