Abstract
The characteristics of the performance of a diode-cladding-pumped Yb3+, Ho3+-doped silica fiber laser are presented. To our knowledge this is the first demonstration of a Yb3+, Ho3+-doped fiber laser, and a maximum output power of 0.85 W was achieved for a launched pump power of 10.9 W. For launched pump powers <7 W, the slope efficiency was ∼12.5%. Visible fluorescence emission with peaks at ∼485, ∼550, and ∼660 nm measured at the output from the laser suggests that excited-state absorption and energy-transfer upconversion losses may impair the functioning of the laser. Increasing the Yb3+ and Ho3+ concentrations and the Yb3+:Ho3+ concentration ratio may lead to an improvement in the overall efficiency of the device.
© 2003 Optical Society of America
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