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Opt Express. 2011 Jul 4;19(14):13578-89. doi: 10.1364/OE.19.013578.

Avoided crossings in photonic crystal fibers.

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  • 1Institute of Applied Physics, Friedrich-Schiller-Universit√§t Jena, Jena, Germany. jansen@iap.uni-jena.de


The impact of avoided crossings (also known as anti-crossings) in single and double-clad large mode area Photonic Crystal Fibers (PCFs) suitable for high-power laser systems is evaluated numerically. It is pointed out that an inappropriate choice of pump core diameter, bending radius and/or index depression may lead to avoided crossings that manifest themselves in unwanted deformations of the output beam.

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