Abstract

A high-power diode-cladding-pumped Ho3+-doped fluoride glass fiber laser operating in cascade mode is demonstrated. The I65I75 and I75I85 laser transitions produced 0.77W at a measured slope efficiency of 12.4% and 0.24W at a measured slope efficiency of 5.2%, respectively. Using a long fiber length, which forced a large threshold for the I75I85 transition, a wavelength of 3.002μm was measured at maximum output power, making this system the first watt-level fiber laser operating in the mid-IR.

© 2011 Optical Society of America

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