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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15168–15182

Increasing mode instability thresholds of fiber amplifiers by gain saturation

Arlee V. Smith and Jesse J. Smith  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15168-15182 (2013)

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We show by numerical modeling that saturation of the population inversion reduces the stimulated thermal Rayleigh gain relative to the laser gain in large mode area fiber amplifiers. We show how to exploit this effect to raise mode instability thresholds by a substantial factor. We also demonstrate that when suppression of stimulated Brillouin scattering and the population saturation effect are both taken into account, counter-pumped amplifiers have higher mode instability thresholds than co-pumped amplifiers for fully Yb3+ doped cores, and confined doping can further raise the thresholds.

© 2013 OSA

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(140.6810) Lasers and laser optics : Thermal effects
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 4, 2013
Revised Manuscript: June 9, 2013
Manuscript Accepted: June 10, 2013
Published: June 18, 2013

Arlee V. Smith and Jesse J. Smith, "Increasing mode instability thresholds of fiber amplifiers by gain saturation," Opt. Express 21, 15168-15182 (2013)

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  1. A.V. Smith and J.J. Smith, “Mode instability in high power fiber amplifiers,” Opt. Express19, 10180–10192 (2011). [CrossRef] [PubMed]
  2. A.V. Smith and J.J. Smith, “A steady-periodic method for modeling mode instability in fiber amplifiers,” Opt. Express21, 2606–2623 (2013). [CrossRef] [PubMed]
  3. A.V. Smith and J.J. Smith, “Influence of pump and seed modulation on the mode instability thresholds of fiber amplifiers,” Opt. Express20, 24545–24558 (2012). [CrossRef] [PubMed]
  4. A.V. Smith and J.J. Smith, “Frequency dependence of mode coupling gain in Yb doped fiber amplifiers due to stimulated thermal Rayleigh scattering,” arXiv:1301.4277 [physics.optics](January18, 2013).
  5. A.V. Smith and J.J. Smith, “Maximizing the mode instability threshold of a fiber amplifier,” arXiv:1301.3489 [physics.optics](January16, 2013).
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  12. M. Hildebrandt, S. Büsche, P. Wessels, M. Frede, and D. Kracht, “Brillouin scattering spectra in high-power single-frequency ytterbium doped fiber amplifiers,” Opt. Express16, 15970–15979 (2008). [CrossRef] [PubMed]
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  17. A.V. Smith and J.J. Smith, “Spontaneous Rayleigh seeding of stimulated Rayleigh scattering in high power fiber amplifiers,” Opt. Express. (submitted).
  18. M.J. Söderlund, J.J. Montiel i Ponsoda, S.K.T. Tammela, K. Ylä-Jarkko, A. Salokatve, and S. Honkanen, “Mode-induced transverse photodarkening loss variations in large-mode-area ytterbium doped silica fibers,” Opt. Express16, 10633–10640 (2008). [CrossRef] [PubMed]

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