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Related Experiment Videos

Dynamics of a random laser above threshold.

G van Soest1, F J Poelwijk, R Sprik

  • 1Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE, Amsterdam, The Netherlands. vansoest@phys.uva.nl

Physical Review Letters
|April 6, 2001
PubMed
Summary
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We studied high gain random lasers and found their intensity does not diverge as predicted. Population dynamics and time dependence are crucial for understanding random laser behavior above threshold.

Area of Science:

  • Physics
  • Optics
  • Condensed Matter Physics

Background:

  • Stationary theories predict laser intensity divergence in high gain random lasers.
  • Experimental observations show a gradual change in the backscatter cone above the laser threshold.

Purpose of the Study:

  • To investigate the behavior of high gain random lasers above the laser threshold.
  • To explain the discrepancy between theoretical predictions and experimental observations of laser intensity.
  • To develop a more comprehensive theory for random lasers.

Main Methods:

  • Performed enhanced backscattering experiments.
  • Developed generalized laser equations incorporating a diffusive transport term for pump and laser light.

Main Results:

Related Experiment Videos

  • Observed a gradual change in the backscatter cone, not the predicted divergence.
  • Theoretical model incorporating diffusive transport and population dynamics explains the experimental results.
  • Population dynamics were identified as a limiting factor for intensity growth.

Conclusions:

  • Time dependence is essential for accurately modeling random lasers above the threshold.
  • The developed theory provides a better understanding of random laser behavior.
  • Population dynamics prevent indefinite intensity growth in random lasers.