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Orbital angular momentum (OAM) based structured light beams provide anadditional degree of freedom for practical applications ranging from opticalcommunication to laser-based material processing. Many techniques exist forgenerating such beams within laser sources and these primarily rely upon theuse of specially designed optical components that limit laser power scaling andready tunability of the topological charge and polarization of the output OAMbeams. Here we show that some of these limitations can be overcome by employinga computer controlled reflective phase-only spatial light modulator (SLM) toadaptively tailor the input (and subsequent output) beam wavefront andpolarization in a few-mode fibre amplifier. In this way modal-coupling inducedbeam distortion within the fibre amplifier can be mitigated and we are able togenerate at will any desired supported spatial mode guided in the fibre,including conventional LP modes, scalar OAM modes and cylindrical vector modes,at average powers >10 W and with a peak power of >11 kW. Our results pave theway to the realization of practical high-power structured laser sources withtunable chirality and polarization.

High power, electronically-controlled, source of user-defined vortex and vector light beams based on a few-mode fibre amplifier