Novel extra-large mode area active and passive fibers deigned to achieve up to 100 mJ and > 1 kW output power in industrial fiber laser systems will be presented. Three Yb-doped XLMA fiber sizes will be proposed, able to offer high extraction efficiency, MW peak power handling, manageable thermal load, excellent spliceability and stable beam profile. Fiber performance capabilities will be discussed with numerical simulation results. Active and passive fiber prototypes will be manufactured and tested. Key design aspects and performances including efficiency, beam profile, cladding absorption and photodarkening will be reported.
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