抄録
Power scaling of single mode Yb‐doped fiber lasers operating at around 1064 nm has now reached the
10 kW level making it suitable for a variety of high power industrial material processing applications1）.
However, progress on narrow linewidth, single frequency fiber amplifiers has been much slower because
of the fundamental limitations from fiber non-linearities such as stimulated Brillouin scattering (SBS) in
the optical fiber. In this paper we discuss the physics of SBS, the fiber and amplifier designs that overcome
this limitation and through optimization have allowed narrow linewidth fiber amplifiers to achieve
output powers exceeding 1 kW for the first time. We also discuss some of the applications enabled by
the latest advances in fiber technology.
