Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Diffractive Optical Element for Noise-reduced Beam Shaping of Multi-array Point Light Source

  • Lee, Jonghyun (Department of Electronics and Information Engineering, Korea University Sejong Campus) ;
  • Hahn, Joonku (School of Electronic and Electrical Engineering, Kyungpook National University) ;
  • Kim, Hwi (Department of Electronics and Information Engineering, Korea University Sejong Campus)
  • Received : 2021.06.25
  • Accepted : 2021.08.10
  • Published : 2021.10.25
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Abstract

An arrayed diffractive optical element design for the beam-shaping of a multi-array light source is proposed. This is an essential device for recent optical security and face recognition applications. In practice, we devise a DC noise reduction technique featuring high fabrication error tolerance regarding the multi-array light source diffractive optical elements, as a necessary part of the proposed design method. The spherical diverging illumination leads to DC-conjugate noise spreading. The main idea is tested experimentally, and the multi-array light source diffraction pattern is investigated numerically.

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Acknowledgement

This study was supported by National Research Foundation of Korea (NRF) (NRF-2019R1A2C1010243).

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