期刊
OPTICS LETTERS
卷 42, 期 10, 页码 1974-1977出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.42.001974
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资金
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-10041]
- Army Research Office (ARO) [W911NF-12-1-0450]
- High Energy Laser Joint Technology Office (HEL JTO) [W911NF-12-1-0450]
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-2) 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 M-2 = 1.3 and an effective mode area of 2560 mu m(2) 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. (C) 2017 Optical Society of America
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