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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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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Self-localized structures in vertical-cavity surface-emitting lasers with external feedback.

P V Paulau1, D Gomila, T Ackemann

  • 1Institute of Physics, NASB, Belarus, Scaryna Prospekt 70, 220072 Minsk, Belarus and Department of Physics, University of Strathclyde, 107 Rottenrow East, Glasgow G4 0NG, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

This study analyzes broad area vertical-cavity surface-emitting lasers with optical feedback, revealing cavity solitons that exist below the laser

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Area of Science:

  • Physics
  • Optics
  • Nonlinear Dynamics

Background:

  • Broad area vertical-cavity surface-emitting lasers (VCSELs) are crucial semiconductor devices.
  • Understanding their behavior under optical feedback is essential for device optimization.
  • Cavity solitons are localized nonlinear states with unique properties.

Purpose of the Study:

  • To analyze the spatio-temporal regimes of broad area VCSELs with frequency-selective optical feedback.
  • To investigate the existence and dynamical properties of cavity solitons in these systems.
  • To construct the bifurcation diagram for stationary self-localized states.

Main Methods:

  • Modeling of broad area VCSELs subjected to frequency-selective optical feedback.
  • Analysis of spatio-temporal regimes above the lasing threshold.
  • Construction of bifurcation diagrams for stationary self-localized states.

Main Results:

  • Branches of cavity solitons emerge from degenerate Hopf bifurcations.
  • These soliton branches collide in a saddle-node bifurcation.
  • A maximum pump current for soliton existence is found below the laser's threshold without feedback.

Conclusions:

  • The study elucidates the formation and existence conditions of cavity solitons in VCSELs with optical feedback.
  • The predicted properties of cavity solitons align well with experimental observations.
  • This research contributes to the fundamental understanding and potential applications of VCSELs.