Abstract
Unidirectional dual-wavelength pumping at 805 and 975 nm of a -doped silica double-clad fiber laser that has been codoped with is demonstrated. With equal 2-wt. % concentrations of the and ions, slope efficiencies of 49% (57%) and 35% (40%) with respect to the launched (absorbed) pump power of the 805- and 975-nm pump wavelengths, respectively, were obtained. Efficient energy transfer and efficient cross relaxation combined with minimal upconversion losses were thus operating. At the maximum output power of 18 W, the fiber laser operated at a center wavelength of 2050 nm.
© 2003 Optical Society of America
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