Abstract

High-power fibre devices have generated great interest for developing platforms that are aimed at breakthrough scientific studies and offer improved solutions for industry. A number of fibre-designs have been proposed [1-5] that are usually based on increasing cross-sectional area (A_eff) of the guided-optical mode. A promising method is the use of higher-order-modes (HOMs), which exhibit reduced bend-distortions and losses with respect to a fundamental mode of comparable A_eff [5,6]. Furthermore, polarization-control of large A_eff, HOMs is crucial for applications in machining, microscopy, etc., [7,8], but has, so far, remained elusive [9-11].

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