Abstract

We have demonstrated dual-wavelength continuous-wave oscillation at 3 and $2 \mathit{\mu }\mathrm{m}$ with a Ho-doped ${\mathrm{ZrF}}_4–{\mathrm{BaF}}_2–{\mathrm{LaF}}_3–{\mathrm{AlF}}_3–\mathrm{NaF}$ 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 $2 \mathit{\mu }\mathrm{m}$) 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 $3‐\mathit{\mu }\mathrm{m}$ output power is to our knowledge higher than any previously reported level with $3‐\mathit{\mu }\mathrm{m}$ ${\mathrm{Ho}}^{3+}$-doped fiber lasers.

© 1998 Optical Society of America

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