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Related Experiment Videos

Laser threshold of Mie resonances.

Karen L van der Molen1, Peter Zijlstra, Ad Lagendijk

  • 1Complex Photonic Systems, MESA+ Research Institute and Department of Science and Technology, University of Twente, AE Enschede, The Netherlands. k.l.vandermolen@utwente.nl

Optics Letters
|April 28, 2006
PubMed
Summary

Scattering coefficients from Mie theory remain meaningful up to the laser threshold. Experiments with gain-enhanced dielectric microspheres confirmed theoretical predictions of resonance narrowing with increasing gain.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Materials Science

Background:

  • Mie theory traditionally describes light scattering by particles.
  • Extending Mie theory to gain media requires theoretical validation.
  • Understanding resonance behavior in gain media is crucial for laser development.

Purpose of the Study:

  • To investigate the physical meaning of time-independent scattering coefficients in the gain regime.
  • To determine the validity of Mie theory extrapolations below the laser threshold.
  • To experimentally verify the theoretical prediction of resonance narrowing with increasing gain.

Main Methods:

  • Calculating time-independent scattering coefficients via Mie theory extrapolation.
  • Performing experiments on dielectric microspheres with optical gain using optical tweezers.

Related Experiment Videos

  • Measuring mode width as a function of gain up to the lasing threshold.

    • Main Results:

    • Time-independent scattering coefficients are physically meaningful up to the laser threshold.
    • Theoretical resonance width decreases linearly with gain, reaching zero at the threshold.
    • Experimental measurements confirmed resonance narrowing with increasing gain.

    Conclusions:

    • The extrapolation of Mie theory to the gain regime is valid below the laser threshold.
    • The divergence point of the extrapolated Mie theory corresponds to the laser threshold.
    • This work validates theoretical models for gain media and provides insights into laser threshold phenomena.