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Efficient operation of double-clad Yb3+-doped fiber lasers with a novel circular cladding geometry
A Martínez-Rios1, A N Starodumov, H Po
1Centro de Investigaciones en Optica A.C., Loma del Bosque 115, Colonia Lomas del Campestre, 37000, León, Gto., Mexico. amr6@foton.cio.mx
Optics Letters
|September 19, 2003
Abstract:
A highly efficient double-clad Yb3+-doped fiber laser with a novel cladding geometry is described. A round double-clad fiber with a small D-shaped hole for breaking a circular symmetry in a cladding combines the advantages of ease of manufacture and handling round fibers with efficient absorption of pump light. Fiber lasers with a double-D cladding shape and a D-hole cladding are compared. We report what are to our knowledge the highest slope efficiencies of 73% and 69%, respectively, pumping at 915 nm. Output powers in excess of 13 W are demonstrated.