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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 440–451

Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems

Cesar Jauregui, Tino Eidam, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Jens Limpert, and Andreas Tünnermann  »View Author Affiliations

Optics Express, Vol. 20, Issue 1, pp. 440-451 (2012)

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Mode-interference along an active fiber in high-power operation gives rise to a longitudinally oscillating temperature profile which, in turn, is converted into a strong index grating via the thermo-optic effect. In the case of mode beating between the fundamental mode and a radially anti-symmetric mode such a grating exhibits two periodic features: a main one which is radially symmetric and has half the period of the modal beating, and a second one that closely follows the mode interference pattern and has its same period. In the case of modal beating between two radially symmetric modes the thermally induced grating only has radially symmetric features and exhibits the same period of the mode interference. The relevance of such gratings in the context of the recently observed mode instabilities of high-power fiber laser systems is discussed.

© 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
(140.6810) Lasers and laser optics : Thermal effects

ToC Category:
Lasers and Laser Optics

Original Manuscript: August 23, 2011
Revised Manuscript: October 7, 2011
Manuscript Accepted: November 16, 2011
Published: December 21, 2011

Cesar Jauregui, Tino Eidam, Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Jens Limpert, and Andreas Tünnermann, "Temperature-induced index gratings and their impact on mode instabilities in high-power fiber laser systems," Opt. Express 20, 440-451 (2012)

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