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Optimal speckle suppression in laser projectors using a single two-dimensional Barker code diffractive optical

Anatoliy Lapchuk1, Andriy Kryuchyn, Vyacheslav Petrov

  • 1Institute for Information Recording of NAS of Ukraine, Shpak Str. 2, Kiev 03113, Ukraine. alapchuk@yahoo.com

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

A novel 2D diffractive optical element (DOE) effectively suppresses speckle noise using Barker codes. This method achieves speckle contrast reduction below human eye sensitivity with minimal optical loss.

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Area of Science:

  • Optics and Photonics
  • Image Processing

Background:

  • Speckle noise degrades image quality in coherent imaging systems.
  • Existing speckle suppression techniques often involve complex setups or significant optical losses.

Purpose of the Study:

  • To develop an effective and efficient speckle suppression method.
  • To investigate the use of a single 2D diffractive optical element (DOE) for speckle reduction.

Main Methods:

  • A 2D diffractive optical element (DOE) utilizing a periodic Barker code sequence was developed.
  • The DOE was moved at a constant velocity for speckle averaging.
  • The method's optical parameters were compared to those using two 1D Barker code DOEs.
  • Speckle averaging by angle diversity was achieved by optimizing DOE movement direction.

Main Results:

  • The 2D DOE method demonstrated equivalent optical parameters to the two 1D DOE method.
  • Full numerical aperture utilization for speckle averaging was enabled through specific DOE movement.
  • A Barker code of length 13 on the 2D DOE reduced speckle contrast below human eye sensitivity.
  • Optical losses were measured to be less than 10%.

Conclusions:

  • A single 2D DOE based on Barker codes offers an effective solution for speckle suppression.
  • This method provides high performance with reduced complexity and minimal optical losses.
  • The technique allows for full objective lens numerical aperture usage in speckle averaging.