This paper reports on a thulium-based channel waveguide laser with a maximum output power of 149 mW and a record-high slope efficiency of 31.5%, which is a significant improvement in terms of slope efficiency and output power.
Jong Won ChungByung Kee MoonJung Hyun JeongJung Hwan Kim
P.S. IvanovI. V. MochalovA. V. Sandulenko
Ratnakar R. NeurgaonkarM.H.K. IsherE. StaplesTae-Young Lim