Highly efficient Yb^3+-doped channel waveguide laser at 981 nm Geskus, D. ; Bernhardi, E. H. ; van Dalfsen, K. ; Aravazhi, S. ; Pollnau, M. Abstract Publication: Optics Express Pub Date: June 2013 DOI: 10.1364/OE.21.013773 Bibcode: 2013OExpr..2113773G