We report efficient amplification of an external cavity diode laser in the 1.06-µm range. The diode laser radiation is coupled into a Nd-doped silica fiber. The fiber is pumped by a diode array with up to 6.15 W of power. After a single pass of the seed radiation through the fiber amplifier, we observe up to 1.74 W of single-mode, narrow-linewidth laser radiation that is tunable over a relatively wide range of 1.060–1.067 µm. The output from our amplifier has the same spectral characteristics as the seed beam.
© 1999 Optical Society of America
Original Manuscript: September 11, 1998
Revised Manuscript: December 4, 1998
Published: March 20, 1999
Remus Nicolaescu, Thomas Walther, Edward S. Fry, and Martin Muendel, "Ultranarrow-linewidth, efficient amplification of low-power seed sources by a fiber amplifier," Appl. Opt. 38, 1784-1787 (1999)