Abstract

We demonstrated 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 20MHz, 750fs pulses were obtained at an average power of 85W in cylindrical polarization and 100W in linear polarization. We also investigated on the use of Yb:YAG single-crystal-fibers with different length/doping ratio and the zero-phonon pumping at a wavelength of 969nm in order to optimize the performance.

© 2015 Optical Society of America

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