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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 4at a doping level of Yb 0.15 mol%,A2O34.0 mol%,and P2O52.0 mol%.High background attenuation of 6 dB/m at 1 053 nm limites the slope efficiency and maximum output power.
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. Slope efficiency is 34%. The refractive index fluctuation across the core is below 5 × 10 4at a doping level of Yb 0.15 mol%, A 2 O 34.0 mol%, and P 2 O 52.0 mol%. High background attenuation of 6 dB / m at 1 053 nm limites the slope efficiency and maximum output power.