High-energy mode-locked all-fiber laser with ultralong resonator |
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Authors: | S. M. Kobtsev S. V. Kukarin S. V. Smirnov Y. S. Fedotov |
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Affiliation: | (1) Fluid Mechanics FB 12, University of Essen, Schützenbahn 70, 45127 Essen, Germany;(2) LightTrans GmbH, Moritz-von-Rohr-Str. 1a, 07745 Jena, Germany;(3) Institut für Angewandte Physik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany |
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Abstract: | The first experimental results on an all-fiber mode-locked ytterbium laser whose ultralong cavity has a length of 8 km are presented. An increase in the length of the laser cavity at a constant mean power of radiation makes it possible to increase the pulse energy by more than two orders of magnitude to a level of 4 μJ, which is record-high for the pulses generated by a fiber mode-locked master oscillator in the absence of Q-switching. A pulse repetition rate of 37 kHz is the record-low repetition rate for the mode-locked lasers. The numerical simulation of the lasing in the absence of extension fiber yields a possibility of a wide-range variation in the pulse duration due to the tuning of the intracavity polarization controllers. The simulation results are in qualitative agreement with the experimental data. |
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