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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15710–15722

Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers

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

Optics Express, Vol. 20, Issue 14, pp. 15710-15722 (2012)

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The temporal behavior of mode instabilities in active large mode area fibers is experimentally investigated in detail. Thus, apart from the onset threshold of mode instabilities, the output beam is characterized using both high-speed camera measurements with 20,000 frames per second and photodiode traces. Based on these measurements, an empiric definition of the power threshold of mode instabilities is introduced. Additionally, it is shown that the temporal dynamics show a transition zone between the stable and the unstable regimes where well-defined periodic temporal fluctuations on ms-timescale can be observed. Finally, it is experimentally shown that the larger the mode-field area, the slower the mode-instability fluctuation is. The observations support the thermal origin of mode instabilities.

© 2012 OSA

OCIS Codes
(140.3510) Lasers and laser optics : Lasers, fiber
(140.6810) Lasers and laser optics : Thermal effects
(190.2055) Nonlinear optics : Dynamic gratings
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:
Lasers and Laser Optics

Original Manuscript: February 8, 2012
Revised Manuscript: March 26, 2012
Manuscript Accepted: May 10, 2012
Published: June 27, 2012

Hans-Jürgen Otto, Fabian Stutzki, Florian Jansen, Tino Eidam, Cesar Jauregui, Jens Limpert, and Andreas Tünnermann, "Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers," Opt. Express 20, 15710-15722 (2012)

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  1. D. J. Richardson, J. Nilsson, and W. A. Clarkson, “High power fiber lasers: current status and future perspectives,” J. Opt. Soc. Am. B27(11), B63–B92 (2010). [CrossRef]
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