Measuring the topological charge of vortex beams by using Shack-Hartmann wavefront sensor with sector microlens array

Ao Tang; Feng Shen; Bin Lan; Yingjian Ge; Jian Li; YiHui Duan

doi:10.1117/12.2565218

17 April 2020 Measuring the topological charge of vortex beams by using Shack-Hartmann wavefront sensor with sector microlens array

Ao Tang, Feng Shen, Bin Lan, Yingjian Ge, Jian Li, YiHui Duan

Author Affiliations +

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 1145568 (2020) https://doi.org/10.1117/12.2565218
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

We presented a new method to measure the topological charge (TC) of the vortex beam (VB) by use a Shack-Hartmann wavefront sensor with sector microlens array (SMLA). The SMLA is circularly symmetric, which perfectly corresponds to helical phase and ring intensity of the VB. On the focal plane, there are spot array with circular distribution due to the special arrangement of the SMLA. In this letter, we also analyzed the error, and concluded that the error of the outer ring is smaller. As a result, we only employed the data of the outermost ring. This method easily can obtain the sign and magnitude of the TC by calculating offset direction and offset of the spots respectively. The simulation results show that our method can determine large TCs and has high accuracy. While this method has a simple structure and can be used in optical communications in the future.

Citation Download Citation

Ao Tang, Feng Shen, Bin Lan, Yingjian Ge, Jian Li, and YiHui Duan "Measuring the topological charge of vortex beams by using Shack-Hartmann wavefront sensor with sector microlens array", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 1145568 (17 April 2020); https://doi.org/10.1117/12.2565218

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