A Yb-doped silica glass fiber laser with a core made by sol-gel method is reported. The maximum power of 1.14 W is obtained with a pump power of 5.46 W at a wavelength of 976 nm. The slope efficiency is 34%. The refractive index fluctuation across the core is below 5×10-4 at a doping level of Yb 0.15 mol%, A2O3 4.0 mol%, and P2O5 2.0 mol%. High background attenuation of 6 dB/m at 1 053 nm limites the slope efficiency and maximum output power.
© 2013 Chinese Optics Letters
Wentao Li, Qinling Zhou, Lei Zhang, Shikai Wang, Meng Wang, Chunlei Yu, Suya Feng, Danping Chen, and Lili Hu, "Watt-level Yb-doped silica glass fiber laser with a core made by sol-gel method," Chin. Opt. Lett. 11, 091601- (2013)