  We report the development of a tunable, low-noise, all-fiber,
single-frequency, linearly polarized high-power master oscillator power
amplifier operating over 20 nm, from 1017 nm down to 997 nm. Using Ytterbium
highly-doped silica fiber with large mode area, more than 3 W of 997 nm signal
was obtained with less than 2 % of ASE. These figures keep improving with
operating wavelength, to reach more than 16 W and 0.03 % of ASE at 1017 nm. The
optical signal to noise ratio exceeds 40dB for the worst case up to more than
60dB. In addition, relative intensity noise remains very low over the whole
tuning range (-130dBc@10kHz) down to-160dBc at 10 MHz. This robust laser has a
strong potential to be a new workhorse for demanding applications in this
spectral range.
