Reduced-symmetry LMA rod-type fiber for enhanced higher-order mode delocalization

Optics Letters
Z Sanjabi EznavehRodrigo Amezcua-Correa

Abstract

We present a novel design of a micro-structured large-pitch, large-mode-area (LMA) asymmetric rod-type fiber. By reducing the cladding symmetry through six high-refractive index germanium-doped silica inclusions, the fiber features strong higher-order mode (HOM) delocalization, leading to a potentially enhanced preferential gain for the fundamental mode in active fibers. In addition, high resolution spatially and spectrally (S<sup>2</sup>) resolved mode analysis measurements confirm HOM contributions below 1% and LP<sub>1m</sub>-like HOM contributions below the detection limit. This proposed fiber design enables single-mode operation, with near-diffraction-limited beam quality of M<sup>2</sup>=1.3 and an effective mode area of 2560  μm<sup>2</sup> at 1064 nm. This design opens new insights into improving the threshold-like onset of modal instabilities in high-power fiber lasers and fiber amplifiers by efficiently suppressing LP<sub>11</sub> modes.

References

Feb 21, 2005·Optics Express·J LimpertC Jakobsen
Apr 3, 2006·Optics Express·J LimpertF Salin
Mar 4, 2011·Optics Letters·Fabian StutzkiAndreas Tünnermann
Apr 20, 2011·Optics Express·Thomas Tanggaard AlkeskjoldJes Broeng
May 21, 2011·Science·Johan Nilsson, David N Payne
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Jul 1, 2011·Optics Express·Fabian StutzkiAndreas Tünnermann
Jul 13, 2011·Optics Express·Florian JansenAndreas Tünnermann
Mar 16, 2012·Optics Express·Florian JansenAndreas Tünnermann
Jun 21, 2012·Optics Express·Cesar JaureguiAndreas Tünnermann
Feb 8, 2013·Optics Express·Kristian Rymann HansenJesper Lægsgaard
May 3, 2014·Optics Express·Xiuquan MaAlmantas Galvanauskas
Dec 10, 2014·Optics Letters·Hans-Jürgen OttoAndreas Tünnermann

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