A widely tunable and highly efficient fiber laser device based on a ytterbi
um-doped double-clad fiber with high output power up to 1.6 W is demonstrat
ed. By using an external cavity in Littrow-Littman configuration the laser
wavelength was tunable over a range of 15.7 THz from 1040 to 1100 nm and a
spectral line width of 0.6 GHz over the whole tuning range was achieved. (C
) 2001 Elsevier Science B.V. All rights reserved.