Modeling of Transient Modal Instability in Fiber Amplifiers

Abstract

A model of transient modal instability in fiber amplifiers is presented. This model combines an optical beam propagation method that incorporates laser gain through local solution of the rate equations and refractive index perturbations caused by the thermo-optic effect with a time-dependent thermal solver with a quantum defect heating source term. This model predicts modal instability in a 285 Watt fiber amplifier characterized by power coupling to un-seeded modes, the presence of stable and unstable regions within the fiber, and rapid intensity variations along the fiber.

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Document Details

Document Type
Technical Report
Publication Date
Feb 26, 2013
Accession Number
AD1015647

Entities

People

  • Benjamin G. Ward

Organizations

  • United States Air Force Academy

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Atomic Energy Levels
  • Boundaries
  • Department Of Defense
  • Energy Levels
  • Equations
  • Fibers
  • Frequency
  • Ground State
  • High Performance Computing
  • Intensity
  • Photonic Crystals
  • Quantum Electronics
  • Refractive Index
  • Scattering
  • Simulations
  • Steady State

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Optical Physics and Photonics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Directed Energy
  • Quantum Computing