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The axis tilt of light beam in optical system would introduce the dispersionof orbital angular momentum (OAM) spectrum. To deal with it, a two-step methodis proposed and demonstrated. First, the tilt angle of optical axis isidentified with a deduced relation between the tilt angle and the variation ofOAM topological charges with different reference axes, which is obtained withthe help of a charge coupled device (CCD) camera. In our experiments, theprecision of measured tilt angle is about 10-4rad with OAM orders of -3~3.Using the measured angle value, the additional phase delay due to axis tilt canbe calculated so that the dispersion of OAM spectrum can be corrected with asimple formula while the optical axis is not aligned. The experimental resultsindicate that the original OAM spectrum has been successfully extracted for notonly the pure OAM state but also the superposed OAM states.

Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam