Generation of Focal Patterns With Uniform Intensity Distribution From Speckle by Hadamard-Genetic Algorithm

Haoran Li; Xiaoyan Wu; Guodong Liu; Xiaoyan Wang; Songjie Luo; Ziyang Chen; Jixiong Pu

doi:10.1109/JPHOT.2021.3075111

IEEE Photonics Journal (Jan 2021)

Generation of Focal Patterns With Uniform Intensity Distribution From Speckle by Hadamard-Genetic Algorithm

Haoran Li,
Xiaoyan Wu,
Guodong Liu,
Xiaoyan Wang,
Songjie Luo,
Ziyang Chen,
Jixiong Pu

Affiliations

Haoran Li: College of Information Science and Engineering, Fujian Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen, Fujian, China
Xiaoyan Wu: Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, China
Guodong Liu: Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, China
Xiaoyan Wang: College of Information Science and Engineering, Fujian Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen, Fujian, China
Songjie Luo: College of Information Science and Engineering, Fujian Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen, Fujian, China
Ziyang Chen: ORCiD; College of Information Science and Engineering, Fujian Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen, Fujian, China
Jixiong Pu: ORCiD; College of Information Science and Engineering, Fujian Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen, Fujian, China

DOI: https://doi.org/10.1109/JPHOT.2021.3075111
Journal volume & issue: Vol. 13, no. 3
pp. 1 – 8

Abstract

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When a coherent beam transmits through a scattering medium, a random intensity distribution known as speckle is generated. Generally, such speckles can be modulated by feedback-based wavefront shaping, as exemplified by the generation of a bright focal spot. However, it is more challenging to generate a specific focal pattern with uniform intensity distribution. In this study, the Hadamard–Genetic algorithm (HGA), namely a hybrid phase modulation scheme of Hadamard encoding algorithm (HEA) and genetic algorithm (GA), is proposed to face these challenges. This algorithm takes advantages of the high intensity of HEA and the high uniformity of GA and outperforms traditional optimization schemes, especially in suppressing intensity fluctuations of the focal pattern. This research is expected to be applied in the field of laser processing and particle manipulation.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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