Defining coiling adiabaticity

Sylvain O'Reilly; Benoit Sévigny; Bertrand Gauvreau

doi:10.1117/12.874803

10 February 2011 Defining coiling adiabaticity

Sylvain O'Reilly, Benoit Sévigny, Bertrand Gauvreau

Proceedings Volume 7914, Fiber Lasers VIII: Technology, Systems, and Applications; 79142J (2011) https://doi.org/10.1117/12.874803
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

Sylvain O'Reilly, Benoit Sévigny, and Bertrand Gauvreau "Defining coiling adiabaticity", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142J (10 February 2011); https://doi.org/10.1117/12.874803

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