瓦级双包层光纤超荧光光源的实验研究

采用大功率半导体激光器抽运25m掺Yb双包层光纤，在单程装置中，前向(SPF)和后向(SPB)分别获得了1．46w和1．82w最大超荧光功率，斜度效率分别为23．4％0和29．2％，3dB带宽最大为11nm。采用特定范围波长双色镜作为前腔镜，形成双程前向(DPF)装置，获得最大超荧光输出功率2．12W，此时斜度效率为43．2％，中心波长在1070nm，输出光谱平坦性较好，3dB带宽从单程的11nm提高到42nm。

The experimental results using two different configuration on high-power Yb-doped double-cladding fiber superfluorescent source (SFS) pumped by 975 nm laser diode are reported. In single-pass forward (SPF) and single-pass backward (SPB) design, the maximum superfluorescent output power is 1.46W and 1.82W, while the slope efficiency is 23.4% and 29.2% respectively. In double-pass forward (DPF) configuration using the dichroic mirror as the front cavity mirror, the maximum superfluorescent output power is 2.12 W with the slope efficiency of 43.2%. And central wavelength of superfluorescent spectrum is 1070 nm, the flatness of output SFS spectrum is greatly improved with the 3 dB bandwidth from 11 nm to 42 nm.