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7 March 2014 Double-clad large mode area Er-doped fiber for high-energy and high-peak power amplifiers
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The use of double-clad fibers for short pulses amplification requires high active ions concentration in order to keep the active fiber length short. In the case of Er-doped fibers an increase of concentration leads to a significant drop of efficiency due to Er ions clustering. We have demonstrated through numerical simulation that efficiency of amplifiers based on double-clad P2O5-Al2O3-SiO2 (PAS) Er-doped fibers decreases slower with Er-concentration growth if compared with standard Al2O3-SiO2 fibers. In this paper, we present single-mode large-mode-area heavily Er-doped double-clad fiber based on PAS glass matrix for short pulses amplification. The developed PAS fiber has a 36 μm singlemode core and a small signal cladding absorption of 3 dB/m at 980 nm leading to an optimal fiber length in range of 5-8 m depending on the central wavelength. At first, an all-fiber nanosecond MOPA at 1560 nm was built using our PAS fiber as the final amplifier. We obtained 28 W of average output power (efficiency of 25 % with respect to the launched pump power at 976) limited by amplified spontaneous emission. Pulse energy of 1.5 mJ was achieved at pump power level of ~120 W. We believe that it is the first demonstration of mJ-energy level single-mode nanosecond fiber system. Then, direct amplification of 100-fs source was performed using this fiber. We obtained 12 nJ pulse energy and 100 kW of peak power from the fiber which is close to the record value for Er-doped fiber amplifiers.
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Leonid V. Kotov, Mikhail M. Bubnov, Denis S. Lipatov, Alexei N. Guryanov, Sébastien Février, Jérôme Lhermite, Eric Cormier, Maxim Yu. Koptev, Elena A. Anashkina, Sergey V. Muraviev, Alexey V. Andrianov, Arkady V. Kim, and Mikhail E. Likhachev "Double-clad large mode area Er-doped fiber for high-energy and high-peak power amplifiers", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89611L (7 March 2014);

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