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Related Experiment Video

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Laser speckle reduction by multimode optical fiber bundle with combined temporal, spatial, and angular diversity.

Dalip Singh Mehta1, Dinesh N Naik, Rakesh Kumar Singh

  • 1Laser Applications and Holography Laboratory, Instrument Design Development Centre, Indian Institute of Technology, Delhi, India. dsmehta@iddc.iitd.ac.in

Applied Optics
|April 27, 2012
PubMed
Summary

This study demonstrates significant laser speckle reduction using a vibrating optical fiber bundle. Combining temporal, spatial, and angular diversities achieves speckle contrast comparable to white light illumination.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Optical Engineering

Background:

  • Laser illumination systems often suffer from coherent artifact noise known as laser speckle.
  • Speckle degrades image quality in applications such as microscopy, remote sensing, and displays.
  • Existing speckle reduction techniques have limitations in effectiveness or complexity.

Purpose of the Study:

  • To investigate the effectiveness of a vibrating multimode optical fiber bundle for laser speckle reduction.
  • To explore the combined impact of temporal, spatial, and angular diversities on speckle reduction.
  • To compare the performance of the proposed method with white light illumination.

Main Methods:

  • Utilizing a vibrating multimode optical fiber bundle illuminated by two independent lasers.
  • Employing expanded, collimated, and divided laser beams with normal and oblique incidence.
  • Incorporating static diffusers at the input and output of the fiber bundle for spatial and angular diversity.
  • Conducting experiments in both free space and imaging configurations.
  • Quantifying speckle reduction through standard deviation, speckle contrast, and signal-to-noise ratio analysis.

Main Results:

  • Significant reduction in laser speckle was achieved using the vibrating fiber bundle.
  • The combined diversities (temporal, spatial, angular) effectively minimized speckle.
  • Speckle contrast values close to those obtained with white light illumination were recorded.
  • Improved signal-to-noise ratio was observed compared to static illumination.

Conclusions:

  • A vibrating multimode optical fiber bundle is a viable and effective method for laser speckle reduction.
  • The integration of temporal, spatial, and angular diversities is crucial for achieving high-quality speckle-free illumination.
  • This technique offers a promising solution for enhancing image quality in laser-based imaging systems.