In 1992, Allen et al. firstly, to the best of our knowledge, demonstrated a helical phase structure of light with wavefront singularities carrying orbital angular momentum (OAM)[
Chinese Optics Letters, Volume. 20, Issue 11, 110501(2022)
Measuring the topological charge of optical vortices with a single plate
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
1. Introduction
In 1992, Allen et al. firstly, to the best of our knowledge, demonstrated a helical phase structure of light with wavefront singularities carrying orbital angular momentum (OAM)[
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Jingyin Zhao, Yunxia Jin, Fanyu Kong, Dongbing He, Hongchao Cao, Wang Hao, Yubo Wu, Jianda Shao. Measuring the topological charge of optical vortices with a single plate[J]. Chinese Optics Letters, 2022, 20(11): 110501
Category: Diffraction, Gratings, and Holography
Received: May. 12, 2022
Accepted: May. 31, 2022
Posted: Jun. 1, 2022
Published Online: Jun. 29, 2022
The Author Email: Yunxia Jin (yxjin@siom.ac.cn)