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Related Experiment Videos

Quality factor control in a lasing microcavity model

Triandaf1, Schwartz

  • 1Special Project in Nonlinear Science, U.S. Naval Research Laboratory, Code 6700.3, Plasma Physics Division, Washington, D.C. 20375-5000, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
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Scientists can control the quality factor (Q factor) of lasing microcavities by deforming them. This deformation alters light escape times, enhancing performance in microlasers and optical fiber coupling.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Microcavities are essential optical resonators (1-10 µm) for microlasers and fiber optics.
  • Whispering gallery modes utilize internal reflection for light confinement.
  • Dielectric microcavities can be deformed, influencing light escape.

Purpose of the Study:

  • To model the dynamics of lasing microcavities.
  • To investigate the effect of cavity deformation on light confinement and escape.
  • To demonstrate control over the resonator's Q factor through mechanical deformation.

Main Methods:

  • Development of a dynamics model for deformable microcavities.
  • Analysis of light trajectories and escape times within the cavity.
  • Mathematical definition of the Q factor (Q=ωτ) relating light frequency (ω) and escape time (τ).

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Main Results:

  • Light escape from the microcavity can be controlled by specific deformations.
  • The Q factor of the resonator is directly tunable via cavity deformation.
  • Deformation allows for prolongation or shortening of light residence time.

Conclusions:

  • Deformable microcavities offer a novel method for active Q factor control.
  • This control mechanism can optimize performance in microlaser applications.
  • Potential for improved optical coupling in fiber optic systems.