  We present a passively mode-locked, tunable soliton Ho:fiber ring oscillator,
optimized for seeding of Ho:YLF amplifiers. The oscillator is independently
tunable in central wavelength and spectral width from 2040 nm to 2070 nm and
from 5 nm to 10 nm, respectively. At all settings the pulse energy within the
soliton is around 800 pJ. The soliton oscillator was optimized to fully meets
the spectral requirements for seeding Ho:YLF amplifiers. Its Kelly sidebands
are located outside the amplifier gain spectrum, resulting in a train of about
1 ps long pedestal-free pulses with relative intensity noise (RIN) of only 0.13
% RMS when integrated from 1 Hz to Nyquist frequency.
