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Breaking the symmetry for enhanced higher-order mode delocalization

 
: Stutzki, Fabian; Jansen, Florian; Jauregui-Misas, Cesar; Limpert, Jens; Tünnermann, Andreas

:

Ramachandran, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XI. Technology, Systems, and Applications : 3 - 6 February 2014, San Francisco, California, United States
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 8961)
ISBN: 978-0-8194-9874-8
Paper 89611N
Conference "Fiber Lasers - Technology, Systems, and Applications" <11, 2014, San Francisco/Calif.>
English
Conference Paper
Fraunhofer IOF ()
very large mode area fibers; large-pitch fiber; single mode; symmetry; spiral

Abstract
Large-pitch fibers (LPFs) have enabled the current records for average power, pulse energy and pulse peak power in ultra-fast fiber laser systems. In this paper the working principle of LPFs, which is based on higher-order mode delocalization, is numerically analyzed paying special attention to thermal effects and index mismatch. An enhanced design concept is proposed with a reduced symmetry to improve the delocalization of higher-order modes. This enhanced design has been obtained by transferring the most important characteristics of spiral geometries to a common hexagonal lattice.

: http://publica.fraunhofer.de/documents/N-283265.html