Highly efficient 750 W tapered double-clad ytterbium fiber laser Filippov, Valery ; Kerttula, Juho ; Chamorovskii, Yuri ; Golant, Konstantin ; Okhotnikov, Oleg G. Abstract Publication: Optics Express Pub Date: June 2010 DOI: 10.1364/OE.18.012499 Bibcode: 2010OExpr..1812499F