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Related Experiment Video

Updated: Jul 8, 2026

A Novel Approach to Overcome Movement Artifact When Using a Laser Speckle Contrast Imaging System for Alternating Speeds of Blood Microcirculation
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Speckle suppression in scanning laser display.

Victor Yurlov1, Anatoly Lapchuk, Sangkyeong Yun

  • 1Samsung Electro-Mechanics Company, Ltd., Korea. victor.yurlov@samsung.com

Applied Optics
|January 12, 2008
PubMed
Summary
This summary is machine-generated.

Speckle noise in scanning displays can be suppressed using diffractive optical elements (DOEs) with Barker code phase shapes. This method leverages natural scanning motion for effective speckle reduction without complex optics.

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Area of Science:

  • Optics
  • Photonics
  • Image Processing

Background:

  • Speckle noise is an inherent artifact in coherent imaging systems, degrading image quality.
  • Existing speckle suppression techniques often require additional optical components or complex scanning mechanisms.

Purpose of the Study:

  • To present the theory of speckle noise in scanning beams.
  • To derive general formulas for speckle contrast applicable to any scanning display.
  • To propose a novel method for speckle suppression using diffractive optical elements (DOEs).

Main Methods:

  • Developed general formulas for calculating speckle contrast in scanning displays.
  • Analyzed the autocorrelation function of the complex amplitude distribution of a scanning light beam.
  • Investigated the application of a DOE with a Barker code phase shape for speckle suppression.

Main Results:

  • Identified narrow autocorrelation peaks and low sidelobe levels as key requirements for speckle suppression.
  • Derived simplified formulas for speckle contrast in beams with narrow autocorrelation peaks.
  • Demonstrated that a DOE with a Barker code phase shape can effectively suppress speckle using natural display scanning.

Conclusions:

  • Speckle suppression in scanning displays relies on specific characteristics of the light beam's autocorrelation function.
  • DOEs with Barker code phase shapes offer a compact and efficient solution for speckle reduction.
  • This DOE-based approach simplifies optical system design by eliminating the need for additional image planes and relay optics.