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  • Received: Jul. 21, 2020

    Accepted: Sep. 22, 2020

    Posted: Dec. 10, 2020

    Published Online: Jan. 4, 2021

    The Author Email: Ziyang Chen (, Jixiong Pu (

    DOI: 10.3788/COL202119.022603

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    Li Chen, Rakesh Kumar Singh, Aristide Dogariu, Ziyang Chen, Jixiong Pu. Estimating topological charge of propagating vortex from single-shot non-imaged speckle[J]. Chinese Optics Letters, 2021, 19(2): 022603

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Chinese Optics Letters, Vol. 19, Issue 2, 022603 (2021)

Estimating topological charge of propagating vortex from single-shot non-imaged speckle

Li Chen1, Rakesh Kumar Singh1,2, Aristide Dogariu3, Ziyang Chen1,3,*, and Jixiong Pu1,4,**

Author Affiliations

  • 1College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
  • 2Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
  • 3CREOL, College of Optics and Photonics, University of Central Florida, Orlando, FL 32816-2700, USA
  • 4Fujian Provincial Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen 361021, China


Encoding information using the topological charge of vortex beams has been proposed for optical communications. The conservation of the topological charge on propagation and the detection of the topological charge by a receiver are significant in these applications and have been well established in free-space. However, when vortex beams enter a diffuser, the wavefront is distorted, leading to a challenge in the conservation and detection of the topological charge. Here, we present a technique to measure the value of the topological charge of a vortex beam obscured in the randomly scattered light. The results of the numerical simulations and experiments are presented and are in good agreement. In particular, only a single-shot measurement is required to detect the topological charge of vortex beams, indicating that the method is applicable to a dynamic diffuser.


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