Reduced-Symmetry Lma Rod-Type Fiber For Enhanced Higher-Order Mode Delocalization

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 (S2) resolved mode analysis measurements confirm HOM contributions below 1% and LP1m-like HOM contributions below the detection limit. This proposed fiber design enables single-mode operation, with near-diffraction-limited beam quality of M2 = 1.3 and an effective mode area of 2560 μm2 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 LP11 modes.

Publication Date

5-15-2017

Publication Title

Optics Letters

Volume

42

Issue

10

Number of Pages

1974-1977

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.42.001974

Socpus ID

85019171390 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85019171390

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