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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

Updated: Jun 10, 2026

Mapping Inhibitory Neuronal Circuits by Laser Scanning Photostimulation
09:50

Mapping Inhibitory Neuronal Circuits by Laser Scanning Photostimulation

Published on: October 6, 2011

Spatially mapping random lasing cavities.

R C Polson1, Z V Vardeny

  • 1Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA. rpolson@physics.utah.edu

Optics Letters
|August 19, 2010
PubMed
Summary

Researchers mapped laser emission in disordered polymers to find naturally formed microcavities. This technique reveals how these microcavities form and lase at different excitation intensities, advancing random laser understanding.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Disordered solid media with optical gain exhibit random laser emission.
  • Understanding the formation and characteristics of lasing microcavities in these materials is crucial for their application.
  • Previous methods lacked spatial resolution for analyzing random laser phenomena.

Purpose of the Study:

  • To develop and apply a novel mapping technique for spatially resolving random laser emission spectra.
  • To identify and characterize naturally formed lasing microcavities within disordered solid media.
  • To investigate the relationship between excitation intensity and microcavity lasing behavior.

Main Methods:

  • Development of a spatial mapping technique to analyze random laser emission spectra.

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  • Application of the technique to pi-conjugated polymer samples.
  • Analysis of emission peak spatial distribution to identify bright areas corresponding to microcavities.
  • Comparison of microcavity sizes obtained from mapping with Fourier transform analysis results.

    • Main Results:

    • The mapping technique successfully resolved spatial variations in random laser emission.
    • Naturally formed lasing microcavities were identified as bright spots in the emission spectrum.
    • The size of these microcavities correlated with Fourier transform analysis.
    • Increased excitation intensities revealed multiple resonant microcavities lasing at higher thresholds.

    Conclusions:

    • The developed mapping technique provides spatial insights into random laser phenomena.
    • Naturally occurring microcavities are key to lasing in disordered media.
    • Excitation intensity plays a critical role in activating multiple lasing microcavities.