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Speckle experiments in random lasers.

Gijs van Soest1, Frank J Poelwijk, Ad Lagendijk

  • 1Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 15, 2002
PubMed
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Speckle analysis in random lasers reveals insights into light transport. Intensity distribution and speckle size provide crucial data on amplification and path lengths within the laser system.

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Condensed Matter Physics

Background:

  • Random lasers offer unique light transport properties.
  • Speckle patterns arise from coherent wave interference.
  • Understanding light propagation is key to laser performance.

Purpose of the Study:

  • To investigate the utility of speckle measurements for characterizing random lasers.
  • To analyze the first-order statistics of speckle in a random laser system.
  • To correlate speckle properties with internal light transport phenomena.

Main Methods:

  • Measurements of speckle patterns in a random laser.
  • Analysis of the intensity distribution P(I) of speckle.
  • Analysis of speckle spot size variations.

Related Experiment Videos

  • Determination of light path length distributions P(Lambda).

    • Main Results:

    • Speckle intensity distribution P(I) quantifies incident probe amplification.
    • Shrinking speckle spot size indicates changes in path length distribution.
    • Average path length is twice as long above threshold compared to passive systems.

    Conclusions:

    • Speckle analysis provides valuable information on light transport in random lasers, unlike passive systems.
    • Intensity distribution and speckle size are effective probes for internal laser dynamics.
    • The findings advance the understanding of light propagation in disordered optical media.