We have designed and realized a cw all-fiber tunable Yb-doped double-clad f
iber laser in a unidirectional ring cavity. The side-pumping V-groove techn
ique is used, yielding very good launching efficiency of the high-power pum
ping laser diode, together with a compact configuration. The fiber laser de
livers as much as 800 mW of power and is tunable in the spectral range 1.04
-1.10 mum. The laser linewidth is similar to0.1nm. (C) 2001 Optical Society
of America.