20 W single-mode Yb3+ -doped phosphate fiber laser.
We report the demonstration of the first, to our knowledge, cladding-pumped continuous-wave Yb(3+)-doped phosphate-glass fiber laser. Phosphate hosts are of interest because they can be much more heavily doped than silica, and because of the possibility that they may have a higher photodarkening threshold. In an 84.6 cm double-clad fiber doped with 12 wt. % of Yb(2)O(3) and laser-diode pumped at 940 nm, nearly 20 W of single-mode 1.07 microm output power was generated with 60.2 W of absorbed pump power. The measured dependence of the output power on pump power is in excellent agreement with simulations.
Lee
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YW
Edward L. Ginzton Laboratory, Stanford University, California 94305, USA. leeyw@stanford.edu
Sinha
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Digonnet
M J F
MJ
Byer
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RL
Jiang
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