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Experimental study of speckle patterns generated by low-coherence semiconductor laser light.

D Halpaap1, M Marconi2, R Hernandez3

  • 1Departament de Fisica, Universitat Politecnica de Catalunya, St. Nebridi 22, 08222 Terrassa, Barcelona, Spain.

Chaos (Woodbury, N.Y.)
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Speckle pattern analysis offers a novel, non-spectral method to evaluate the coherence of semiconductor laser light. This technique applies to conventional laser diodes and coupled nanolasers, providing insights into light properties.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Wave Interference Phenomena

Background:

  • Speckle patterns arise from wave interference, containing spectral information about waves and scattering media.
  • Understanding speckle is crucial in fields like optics, hydrodynamics, and acoustics.
  • Semiconductor lasers are vital light sources, but assessing their coherence can be complex.

Purpose of the Study:

  • To experimentally investigate speckle patterns generated by semiconductor lasers.
  • To analyze the intensity statistics of speckle patterns to determine light coherence.
  • To demonstrate speckle analysis as a non-spectral method for assessing semiconductor laser coherence.

Main Methods:

  • Generating low-coherence emission from conventional laser diodes via optical feedback or pump current modulation.
  • Studying speckle patterns from coupled nanolasers.
  • Analyzing the intensity statistics of generated speckle patterns.

Main Results:

  • Speckle patterns were successfully generated and analyzed from both types of semiconductor lasers.
  • Intensity statistics of the speckle patterns correlated with the degree of light coherence.
  • The study confirmed speckle analysis as a viable non-spectral coherence assessment tool.

Conclusions:

  • Speckle analysis provides an effective, non-spectral approach to evaluate semiconductor laser coherence.
  • This method is applicable to various semiconductor laser configurations, including laser diodes and nanolasers.
  • The findings contribute to a deeper understanding of light-matter interactions and laser characterization.