We report on the study of direct amplification of femtosecond pulses in an core diameter microstructured Yb-doped rod-type fiber amplifier in the nonlinear regime. The system includes a compact single grating compressor for the compensation of the small dispersion in the amplifier. With a (l/mm) grating-based compressor, pulses as short as with pulse energy and peak power are obtained. Alternatively, the use of a grating allows the production of higher quality pulses of , pulse energy, and peak power.
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