Single mode fiber based delivery of OAM light by 3D direct laser writing
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Opt. Express 25 (17): 19672--19679 (August 2017)

We demonstrate orbital-angular momentum (OAM) light up to a topological charge of l$=$3 behind a single mode fiber. Femtosecond 3D direct laser writing is used to fabricate spiral phase plates of l$=$1,2 and 3, composed of 10 discrete steps, on the tip of single mode optical fibers. These structures efficiently convert out-coupled light from the fiber at 785&\#x2009;nm wavelength into optical vortex beams carrying an orbital-angular momentum of l&\#x210F;per photon. Far field intensity patterns and interferograms of the OAM beams are recorded using a CCD camera. The results are in excellent agreement with numerical simulations obtained from the wave propagation method.
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