In-band pumping of Tm -LiYF4 channel waveguide - a power scaling strategy for ∼2 μm waveguide lasers
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2019-06-05 |
| Journal | Optics Letters |
| Authors | Pavel Loiko, Romain Thouroude, Rémi Soulard, Lauren Guillemot, Gurvan Brasse |
| Institutions | Centre National de la Recherche Scientifique, Université Marie et Louis Pasteur |
| Citations | 36 |
Abstract
Section titled “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 Tm<sup>3+</sup>:LiYF<sub>4</sub>/LiYF<sub>4</sub> epitaxies via diamond-saw dicing. They are pumped by a RFL based on an erbium master oscillator power amplifier and a GeO<sub>2</sub>-doped silica fiber and emit polarized output at 1679 nm. A CW in-band-pumped (H<sub>6</sub>3→F<sub>4</sub>3) Tm<sup>3+</sup>:LiYF<sub>4</sub> 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).