title: High-power, broadly tunable, and low-quantum-defect KGd(1-x)Lu(x)(WO(4))(2):Yb(3+) channel waveguide lasers.
abstract: In KGd(1-x)Lu(x)(WO(4))(2):Yb(3+) channel waveguides grown onto KY(WO(4))(2) substrates by liquid phase epitaxy and microstructured by Ar+ beam etching, we produced 418 mW of continuous-wave output power at 1023 nm with a slope efficiency of 71% and a threshold of 40 mW of launched pump power at 981 nm. The degree of output coupling was 70%. By grating tuning in an extended cavity and pumping at 930 nm, we demonstrated laser operation from 980 nm to 1045 nm. When pumping at 973 nm, lasing at 980 nm with a record-low quantum defect of 0.7% was achieved.
authors.affiliation: Integrated Optical Microsystems Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, Netherlands. d.geskus@ewi.utwente.nl
authors.forename: Dimitri
authors.initials: D
authors.lastname: Geskus
authors.forename: Shanmugam
authors.initials: S
authors.lastname: Aravazhi
authors.forename: Kerstin
authors.initials: K
authors.lastname: Wörhoff
authors.forename: Markus
authors.initials: M
authors.lastname: Pollnau
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D053844:Lasers, Solid-State