Tunable orbital angular momentum mode filter based on optical geometric transformation

Abstract

We present a tunable mode filter for spatially multiplexed laser beams carrying orbital angular momentum (OAM). The filter comprises an optical geometric transformation-based OAM mode sorter and a spatial light modulator (SLM). The programmable SLM can selectively control the passing/blocking of each input OAM beam. We experimentally demonstrate tunable filtering of one or multiple OAM modes from four multiplexed input OAM modes with vortex charge of $\ell =-9$, $-4$, $+4$, and $+9$. The measured output power suppression ratio of the propagated modes to the blocked modes exceeds 14.5 dB.

© 2014 Optical Society of America

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