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High-power linear-polarized narrow linewidth photonic crystal fiber amplifier

: Wirth, C.; Schreiber, T.; Rekas, M.; Tsybin, I.; Peschel, T.; Eberhardt, R.; Tünnermann, A.


Tankala, K. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber lasers VII. Technology, systems, and applications : 25 - 28 January 2010, San Francisco, California, United States; at SPIE Photonics West
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7580)
ISBN: 978-0-8194-7976-1
Paper 75801H
Conference "Fiber Lasers - Technology, Systems, and Applications" <7, 2010, San Francisco/Calif.>
Photonics West Conference <2010, San Franciso/Calif.>
Conference Paper
Fraunhofer IOF ()
fiber laser; fiber amplifier

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.