title: Mode-field adapter for tapered-fiber-bundle signal and pump combiners.
abstract: We report on a novel mode-field adapter that is proposed to be incorporated inside tapered fused-fiber-bundle pump and signal combiners for high-power double-clad fiber lasers. Such an adapter allows optimization of signal-mode-field matching on the input and output fibers. Correspondingly, losses of the combiner signal branch are significantly reduced. The mode-field adapter optimization procedure is demonstrated on a combiner based on commercially available fibers. Signal wavelengths of 1.55 and 2 μm are considered. The losses can be further improved by using specially designed intermediate fiber and by dopant diffusion during splicing as confirmed by preliminary experimental results.
authors.forename: Pavel
authors.initials: P
authors.lastname: Koška
authors.forename: Yauhen
authors.initials: Y
authors.lastname: Baravets
authors.forename: Pavel
authors.initials: P
authors.lastname: Peterka
authors.forename: Jan
authors.initials: J
authors.lastname: Bohata
authors.forename: Michael
authors.initials: M
authors.lastname: Písařík