Kilowatt-level tunable all-fiber narrowband superfluorescent fiber source with 40 nm tuning range
Zhe Li, Gang Li, Qi Gao, Peng Wu, Shengfei She, Zhaolu Wang, Nan Huang, Chuandong Sun, Wei Gao, Pei Ju, Hongjun Liu
Abstract
In this study, we presented a high-power widely tunable all-fiber narrowband superfluorescent fiber source (SFS) by employing two tunable bandpass filters and three amplifier stages. More than 935 W output power is achieved, with a slope efficiency of >75% and a beam quality factor of M 2 =1.40. The tuning of the narrowband SFS ranges from ∼1045 nm to ∼1085 nm with a full width at half maximum linewidth of less than 0.71 nm. The tunable narrowband SFS stably operates without the influence of parasitic oscillation and self-pulsing effects under maximum power. To the best of our knowledge, this study is the first to demonstrate a widely tunable all-fiber narrowband SFS around 1 µm wavelength region with output power reaching kilowatt-level.