Widely Tunable Single-Mode Yb-Doped All-Fiber Master Oscillator Power Amplifier

A Yb-doped linearly polarized fiber ring oscillator continuously tunable from 1000 to 1099 nm is built and amplification over the whole range is investigated with emphasis on the short wavelength regime of 1000-1025 nm. With an all-fiber single-mode polarization-maintaining master oscillator power amplifier, over 10 W output from 1010 to 1090 nm and over 30 W from 1014 to 1080 nm are achieved. At wavelength