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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: May 21, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Directional single mode emission in a microcavity laser.

Myung-Woon Kim1, Chang-Hwan Yi, Sunghwan Rim

  • 1Department of Physics, Sogang University, Seoul 121-742, South Korea.

Optics Express
|June 21, 2012
PubMed
Summary

We achieved directional single-mode emission from a novel InGaAsP semiconductor microcavity laser. This scar mode laser operates stably across various injection currents, demonstrating precise control over light output.

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Area of Science:

  • Semiconductor physics
  • Optoelectronics
  • Photonics

Background:

  • Semiconductor microcavity lasers are crucial for optoelectronic devices.
  • Achieving stable, directional single-mode emission is a key challenge.
  • Scar modes in microcavities offer unique light confinement properties.

Purpose of the Study:

  • To demonstrate directional single-mode emission in a novel InGaAsP semiconductor microcavity laser.
  • To investigate the lasing behavior of scar modes under continuous injection.
  • To validate experimental findings with numerical simulations.

Main Methods:

  • Fabrication of an InGaAsP semiconductor microcavity laser with a combined circular and isosceles trapezoid shape.
  • Experimental excitation of the cavity and measurement of emission spectra and far-field patterns.
  • Numerical analysis using the boundary element method to model resonance and far-field characteristics.

Main Results:

  • Directional single-mode emission was successfully achieved.
  • Stable single-mode operation without mode hopping was observed over a wide range of injection currents.
  • Equidistant mode spacing in the emission spectrum confirmed scar mode dominance above the lasing threshold.
  • Numerical simulations of the far-field pattern closely matched experimental results.

Conclusions:

  • The designed InGaAsP microcavity laser effectively supports directional single-mode emission.
  • Scar modes are crucial for achieving stable, single-mode lasing in this geometry.
  • The boundary element method provides accurate predictions for the laser's optical performance.