Abstract
We report on a novel power scaling strategy for thulium waveguide (WG) lasers relying on in-band pumping by high-brightness Raman fiber lasers (RFLs) and the use of liquid-phase-epitaxy-grown fluoride crystalline thin films for better thermal management. Thulium channel WGs are produced by microstructuring the epitaxies via diamond-saw dicing. They are pumped by a RFL based on an erbium master oscillator power amplifier and a -doped silica fiber and emit polarized output at 1679 nm. A CW in-band-pumped () WG laser generates up to 2.05 W of a linearly polarized single-transverse-mode output at 1881 nm with a slope efficiency of 78.3% and a laser threshold of only 12 mW (versus the absorbed pump power).
© 2019 Optical Society of America
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