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High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers in cylindrical polarization

Fabien Lesparre, Jean Thomas Gomes, Xavier Délen, Igor Martial, Julien Didierjean, Wolfgang Pallmann, Bojan Resan, Michael Eckerle, Thomas Graf, Marwan Abdou Ahmed, Frederic Druon, François Balembois, and Patrick Georges

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Abstract

We demonstrate a three-stage diode-pumped Yb:YAG single-crystal-fiber amplifier to generate femtosecond pulses at high average powers with linear or cylindrical (i.e., radial or azimuthal) polarization. At a repetition rate of 20 MHz, 750-fs pulses were obtained at an average power of 85 W in cylindrical polarization and at 100 W in linear polarization. The report includes investigations on the use of Yb:YAG single-crystal fibers with different length/doping ratio and the zero-phonon pumping at a wavelength of 969 nm in order to optimize the performance.

© 2015 Optical Society of America

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