Request InfoNKT Photonics A/SNKT Photonics A/S has introduced a new version of its double-clad rod-type fiber for use in fiber amplifiers. The DC-285/100-PM-Yb-ROD is based on proprietary and patented Crystal Fibre air-clad technology and features a single-mode 100-µm polarization-maintaining core with high absorption and low photodarkening. The ytterbium-doped rod is used in output stages of amplifier chains for high-power pulsed laser amplification, where it can sustain megawatt peak power levels. The ytterbium core has an effective mode field area of >4500 µm2. 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