KW-power fiber lasers with single-transverse mode output using standard 20-μm core Yb-doped DC fibers

摘要

In conclusion, we have demonstrated high power cw single transverse mode beam from a 20-μm core fiber laser. Such advancement constitutes an important technological step in developing other types of fiber based laser systems, since such low-NA core size is compatible with other fiber components (couplers, gratings, etc.). Extremely high output powers from such lasers enable a variety of practically significant applications which were not possible previously. It is likely that the demonstrated powers do not represent the limit for the fiber technology and can be scaled further towards multi-kW power levels from a single fiber emitter.