Abstract

220-fs pulses with energies of 100 μJ have been generated by use of two different configurations of diode-pumped Yb-fiber chirped-pulse amplification systems. Energy scaling was demonstrated with 25μm-core diameter fibers, in which stable diffraction-limited output M21.1 was achieved. A two-stage fiber-amplifier system produced average powers of up to 5.5  W at 1MHz pulse-repetition rate. A double-pass configuration provided 53-dB gain in a single Yb-fiber amplifier stage, thus eliminating the necessity for multiple amplification stages as well as the need for using polarization-preserving fibers.

© 2001 Optical Society of America

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