Abstract

Laser experiments were performed on buried, ridge-type channel waveguides in 8 at.% thulium-doped, yttrium–gadolinium–lutetium co-doped potassium double tungstate. By pumping with a Ti:sapphire laser at 794 nm, 1.6 W of output power at 1.84 μm with a maximum slope efficiency of 80% was obtained in a laser resonator with a high output-coupling degree of 89%. To the best of our knowledge, this result represents the most efficient 2-μm channel waveguide laser to date.

© 2014 Optical Society of America

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