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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 4 — Feb. 14, 2011
  • pp: 3258–3271

Impact of modal interference on the beam quality of high-power fiber amplifiers

Cesar Jauregui, Tino Eidam, Jens Limpert, and Andreas Tünnermann  »View Author Affiliations


Optics Express, Vol. 19, Issue 4, pp. 3258-3271 (2011)
http://dx.doi.org/10.1364/OE.19.003258


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Abstract

Recent work on high-power fiber amplifiers report on a degradation of the output beam quality or even on the appearance of mode instabilities. By combining the transversally resolved rate equations with a 3D Beam propagation method we have managed to create a model able to provide an explanation of what we believe is at the root of this effect. Even though this beam quality degradation is conventionally linked to transversal hole burning, our simulations show that this alone cannot explain the effect in very large mode area fibers. According to the model presented in this paper, the most likely cause for the beam quality degradation is an inversion-induced grating created by the interplay between modal interference along the fiber and transversal hole burning.

© 2011 OSA

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.2400) Fiber optics and optical communications : Fiber properties

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: October 14, 2010
Revised Manuscript: December 24, 2010
Manuscript Accepted: January 3, 2011
Published: February 3, 2011

Virtual Issues
February 18, 2011 Spotlight on Optics

Citation
Cesar Jauregui, Tino Eidam, Jens Limpert, and Andreas Tünnermann, "Impact of modal interference on the beam quality of high-power fiber amplifiers," Opt. Express 19, 3258-3271 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-4-3258


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