Diode-cladding-pumped Yb³⁺, Ho³⁺-doped silica fiber laser operating at 2.1-μm

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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