Efficient Yb fiber laser at 980 nm pumped by the high-brightness semiconductor source

Summary form only given. The present work deals with the fabrication of a special active fibers and Yb-doped fiber laser pumped by Superfocus to get an efficient high power oscillation in the vicinity of 980 nm. To build the fiber laser we have used the fiber with an all-silica inner cladding with NA of 0.22 and 25 /spl mu/m diameter and a core with a 6 /spl mu/m diameter. The laser cavity was formed by two gratings with reflection of 99% and 70% for input and output coupler respectively. To minimize the intracavity losses, Bragg gratings were written in the H/sub 2/-loaded active fiber without any splices inside the laser cavity.