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17 February 2010 High-power linear-polarized narrow linewidth photonic crystal fiber amplifier
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We report on the high power amplification of narrow linewidth laser radiation with close to diffraction limited beam quality using a large mode area photonic crystal fiber amplifier. The observation of threshold-like higher order mode amplification by transverse spatial-hole burning at the highest power level is reported. The measured M² stays below 1.3 but increases at the critical power level, where the fundamental mode turns into the next higher order mode. At the maximum power of 1.2 kW a linewidth of <80 pm limited by self-phase modulation is obtained.
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Christian Wirth, Thomas Schreiber, Miroslaw Rekas, Igor Tsybin, Thomas Peschel, Ramona Eberhardt, and Andreas Tünnermann "High-power linear-polarized narrow linewidth photonic crystal fiber amplifier", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801H (17 February 2010);

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