Journal
CHINESE OPTICS LETTERS
Volume 20, Issue 11, Pages -Publisher
Optica Publishing Group
DOI: 10.3788/COL202220.110501
Keywords
optical vortex; orbital angular momentum; topological charge measurement
Categories
Funding
- National Key R&D Program of China [2020YFA0714500]
- National Natural Science Foundation of China [61875212, U1831211]
- Shanghai Strategic Emerging Industry Development Special Fund [31011442501217020191D3101001]
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Measuring the topological charge (TC) of optical vortex beams by the edge-diffraction pattern of a single plate is proposed and demonstrated in this paper. The redundant fringes of the diffracted fork-shaped pattern can determine the TC value, and the orientation of the fork indicates the handedness of the vortex. The method is practical and easy to implement, offering convenience and efficiency for researchers.
Measuring the topological charge (TC) of optical vortex beams by the edge-diffraction pattern of a single plate is proposed and demonstrated. The diffraction fringes can keep well discernible in a wide three-dimensional range in this method. The redundant fringes of the diffracted fork-shaped pattern in the near-field can determine the TC value, and the orientation of the fork tells the handedness of the vortex. The plate can be opaque or translucent, and the requirement of the translucent plate for TC measurement is analyzed. Measurement of TCs up to +/- 40 is experimentally demonstrated by subtracting the upper and lower fringe numbers with respect to the center of the light. The plate is easy to get, and this feasible measurement can bring great convenience and efficiency for researchers.
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