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Related Experiment Videos

Photon localization laser: low-threshold lasing in a random amplifying layered medium via wave localization.

Valery Milner1, Azriel Z Genack

  • 1Department of Physics, Queens College of the City University of New York, Flushing, New York 11367, USA.

Physical Review Letters
|March 24, 2005
PubMed
Summary

We achieved low-threshold lasing in random layered media by utilizing photon localization. This method enhances light intensity deep within the material, overcoming limitations of traditional diffusive random lasers.

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Area of Science:

  • Photonics and Optics
  • Condensed Matter Physics

Background:

  • Diffusive random lasers typically suffer from high thresholds due to surface-limited excitation caused by multiple scattering.
  • Achieving efficient light-matter interaction deep within a random medium is a significant challenge.

Purpose of the Study:

  • To demonstrate low-threshold lasing in a random amplifying layered medium.
  • To investigate the role of photon localization in enhancing lasing efficiency.
  • To overcome the excitation limitations inherent in diffusive random lasers.

Main Methods:

  • Fabrication of a random amplifying layered medium.
  • Utilizing resonant excitation of localized modes at the pump laser wavelength.
  • Characterizing lasing behavior and emission properties.

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Main Results:

  • Achieved low-threshold lasing through photon localization.
  • Demonstrated resonant excitation of localized modes with enhanced intensity deep within the sample.
  • Observed emission into long-lived localized modes overlapping the gain region.

Conclusions:

  • Photon localization provides an effective mechanism for achieving low-threshold lasing in random media.
  • This approach overcomes the fundamental barrier of limited excitation depth in diffusive random lasers.
  • The findings open new avenues for developing more efficient random laser devices.