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Opt Express. 2011 Apr 11;19(8):7398-409. doi: 10.1364/OE.19.007398.

Single-Mode ytterbium-doped Large-Mode-Area photonic bandgap rod fiber amplifier.

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NKT Photonics, Blokken 84, 3460 Birkerød, Denmark.


Enabling Single-Mode (SM) operation in Large-Mode-Area (LMA) fiber amplifiers and lasers is critical, since a SM output ensures high beam quality and excellent pointing stability. In this paper, we demonstrate and test a new design approach for achieving SM LMA rod fibers by using a photonic bandgap structure. The structure allows resonant coupling of higher-order modes from the core and acts as a spatially Distributed Mode Filter (DMF). With this approach, we demonstrate passive SM performance in an only ~50 cm long and straight ytterbium-doped rod fiber. The amplifier has a mode field diameter of ~59 µm at 1064 nm and exhibits a pump absorption of 27 dB/m at 976 nm.

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