Speckle-based determination of the polarisation state of single and multiple laser beams

Morgan Facchin, Graham D. Bruce, Kishan Dholakia

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Laser speckle is generated by the multiple interference of light through a disordered medium. Here we study the premise that the speckle pattern retains information about the polarisation state of the incident field. We analytically verify that a linear relation exists between the Stokes vector of the light and the resulting speckle pattern. As a result, the polarisation state of a beam can be measured from the speckle pattern using a transmission matrix approach. We perform a quantitative analysis of the accuracy of the transmission matrix method to measure randomly time-varying polarisation states. In experiment, we find that the Stokes parameters of light from a diode laser can be retrieved with an uncertainty of 0.05 using speckle images of 150×150 pixels and 17 training states. We show both analytically and in experiment that this approach may be extended to the case of more than one laser field, demonstrating the measurement of the Stokes parameters of two laser beams simultaneously from a single speckle pattern and achieving the same uncertainty of 0.05.

Original languageEnglish
Pages (from-to)1302-1313
Number of pages12
JournalOSA Continuum
Volume3
Issue number5
DOIs
Publication statusPublished - 2020 May 15

Bibliographical note

Publisher Copyright:
© 2020 OSA - The Optical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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