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Spatial extent of random laser modes.

Karen L van der Molen1, R Willem Tjerkstra, Allard P Mosk

  • 1Complex Photonic Systems, MESA Institute for Nanotechnology and Department of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. kvandermolen@alumnus.utwente.nl

Physical Review Letters
|May 16, 2007
PubMed
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Researchers studied random lasers made from porous gallium phosphide, observing mode competition and spectral properties. Their findings align with random-matrix theory, offering insights into multimode laser behavior.

Area of Science:

  • Photonics and Optics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Random lasers offer unique light emission properties.
  • Porous materials with high index contrast are ideal for studying random laser phenomena.
  • Understanding mode behavior is crucial for laser design and applications.

Purpose of the Study:

  • To experimentally investigate mode spatial extent and the transition to multimode behavior in a porous gallium phosphide random laser.
  • To analyze mode competition within the multimode regime.
  • To characterize spectral mode spacing distributions and compare them with theoretical models.

Main Methods:

  • Fabrication and characterization of a porous gallium phosphide random laser.
  • Experimental measurement of mode spatial extent.

Related Experiment Videos

  • Spectroscopic analysis of laser emission, including mode spacing distributions.
  • Application of random-matrix theory, specifically the Gaussian orthogonal ensemble, for data analysis.

    • Main Results:

    • Detailed study of the spatial extent of modes in the random laser.
    • Observation of a clear crossover from single-mode to multimode lasing.
    • Evidence of mode competition in the multimode regime.
    • Measured spectral mode spacings exhibit level repulsion consistent with the Gaussian orthogonal ensemble.

    Conclusions:

    • Porous gallium phosphide serves as an excellent platform for random laser research due to its high index contrast.
    • The observed mode competition and spectral properties validate the use of random-matrix theory in describing multimode random lasers.