High-power superfluorescent source of Yb3+-doped double-cladding photonic crystal fiber

Abstract:

A new type of high-power broadband superfluorescent source of Yb³⁺-doped double-cladding photonic crystal fiber is reported experimentally, which is pumped at 976 nm by a high-power laser diode with the end-coupling method. We have obtained a smooth broadband output of superfluorescence. The maximum output power is 1.649 W with a slope efficiency of 56.7%. The 3 dB bandwidth is 22.4 nm. To the best of our knowledge, this is the first report about SFS with such high output power of 1.649 W. This work was supported by the National Natural Science Foundation under Grant No. 60377010, the “973” Project under Grant No. 2003CG314906 and the Research Fund for Doctoral Programme for Higher Education under Grant No. 2003005016.