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Related Experiment Videos

Evanescent-wave-excited quasi-two-dimensional random lasing.

Sushil Mujumdar1, Hema Ramachandran, N Kumar

  • 1Raman Research Institute, C.V. Raman Ave., Sadashivnagar, Banglaore, India.

Optics Letters
|August 29, 2006
PubMed
Summary

We achieved random lasing in a quasi-two-dimensional dye-scatterer system using evanescent wave excitation. This method enhanced spectral narrowing and revealed unique intensity behaviors, reducing the lasing threshold at higher dye concentrations.

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Area of Science:

  • Photonics and optical physics
  • Materials science
  • Condensed matter physics

Background:

  • Random lasing offers potential for low-cost coherent light sources.
  • Evanescent wave excitation provides localized energy delivery.
  • Controlling excitation and scattering is key to optimizing random laser performance.

Purpose of the Study:

  • To investigate random lasing in a quasi-2D dye-scatterer system.
  • To explore the effects of evanescent mode excitation on lasing properties.
  • To analyze the influence of dye concentration on threshold and intensity behavior.

Main Methods:

  • Fabrication of a quasi-two-dimensional dye-scatterer system.
  • Excitation using evanescent modes generated at a dielectric-dielectric interface.

Related Experiment Videos

  • Characterization of spectral narrowing and peak intensity under varying dye concentrations.

    • Main Results:

    • Achieved spectral narrowing by a factor of approximately 13 under diffusive scattering.
    • Observed unique dual-saturation behavior in peak intensity due to localized excitation.
    • Demonstrated a reduced lasing threshold with increased dye concentration.

    Conclusions:

    • Evanescent mode excitation is effective for achieving random lasing in quasi-2D systems.
    • Localized excitation and diffusive scattering significantly influence random laser characteristics.
    • Optimizing dye concentration is crucial for lowering the lasing threshold and enhancing performance.