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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 20 — Oct. 15, 2012
  • pp: 4242–4244

Beam quality degradation of a single-frequency Yb-doped photonic crystal fiber amplifier with low mode instability threshold power

Malte Karow, Henrik Tünnermann, Jörg Neumann, Dietmar Kracht, and Peter Weßels  »View Author Affiliations


Optics Letters, Vol. 37, Issue 20, pp. 4242-4244 (2012)
http://dx.doi.org/10.1364/OL.37.004242


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Abstract

A current limit in power scaling of Yb-doped fiber amplifiers is the sudden onset of mode instabilities. We investigated this effect on a single-frequency Yb-doped photonic crystal fiber amplifier with a low mode instability threshold power. By measuring the overlap of the fiber output beam with the fundamental mode of an external cavity to be about 95%, we could exclude significant modal power transfer below a sharp power threshold. Furthermore, we directly measured the frequency resolved intensity noise spectra. No fluctuations in the overall output power were observed, but for the modal content different oscillation regimes were identified.

© 2012 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3295) Lasers and laser optics : Laser beam characterization
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 27, 2012
Revised Manuscript: September 7, 2012
Manuscript Accepted: September 7, 2012
Published: October 9, 2012

Citation
Malte Karow, Henrik Tünnermann, Jörg Neumann, Dietmar Kracht, and Peter Weßels, "Beam quality degradation of a single-frequency Yb-doped photonic crystal fiber amplifier with low mode instability threshold power," Opt. Lett. 37, 4242-4244 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-20-4242


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