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Proceedings Paper

Defining coiling adiabaticity
Author(s): Sylvain O'Reilly; Benoit Sévigny; Bertrand Gauvreau
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Paper Abstract

Most common high power fiber lasers use large mode area (LMA) fiber to reduce unwanted non-linearity. Such fibers usually guide few modes but operate close to single mode regime (underfill condition) for best beam quality. For packaging considerations or for high order mode filtering, coiling the gain fiber is mandatory. Determining the best coiling architecture may look simple but extra care must be taken when dealing with few moded LMA fiber. We present a formalism to quantitatively express the adiabaticity of an optical fiber coil based on the normalized coupling coefficient betweens modes. The goal is to evaluate the capability of a coiling system to preserve the modal repartition of the optical intensity and preserve beam quality at fiber output. We present typical coiling configurations as examples. A simple interferometric measurement setup is proposed to study figures of merit of a coil.

Paper Details

Date Published: 10 February 2011
PDF: 7 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142J (10 February 2011); doi: 10.1117/12.874803
Show Author Affiliations
Sylvain O'Reilly, ITF Labs./Avensys Tech (Canada)
Benoit Sévigny, ITF Labs./Avensys Tech (Canada)
Bertrand Gauvreau, ITF Labs./Avensys Tech (Canada)

Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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