We report on a -doped sesquioxide waveguide laser based on a lattice-matched film that has been epitaxially grown on using pulsed laser deposition. Rib-channel waveguides have been structured by reactive ion etching. Laser emission at was observed under pumping with a laser at . A laser threshold of and a slope efficiency of 6.7% have been achieved with respect to input power. For an incident pump power of , a maximum output power of could be realized.
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