Abstract

We have demonstrated dual-wavelength continuous-wave oscillation at 3 and 2 μm with a Ho-doped ZrF<sub>4</sub>– BaF<sub>2</sub>– LaF<sub>3</sub>– AlF<sub>3</sub>– NaF fluoride-glass fiber laser by use of a cascade oscillation scheme. We have shown that the fiber laser operates with a high slope efficiency of 52% (at 3 and 2µm) with respect to the absorbed pump power. With a 6.5-m-long fiber we achieved an output power of 90 mW at each of the wavelengths that was limited only by the pump power, and the 3-µm output power is to our knowledge higher than any previously reported level with 3-μm Ho<sup>3+</sup> -doped fiber lasers.

© 1998 Optical Society of America

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