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We report experiments aimed at measuring the orbital angular momentum of light by means of a torsion pendulum, in the spirit of the classical spin angular momentum experiment by Beth (1936) but using present-day technology. Although our set-up has adequate sensitivity and resolution to measure orbital angular momentum of light, the systematic errors that are caused by the inherent asymmetry in the conversion of orbital angular moment remain a problem.
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Marco W. Beijersbergen, J. P. Woerdman, "Measuring orbital angular momentum of light with a torsion pendulum," Proc. SPIE 5736, Nanomanipulation with Light, (14 March 2005); https://doi.org/10.1117/12.584515