Abstract

Coherent combination of multiple fiber amplifiers in a chirped-pulse-amplification system allows achieving mJ-class femtosecond pulses at unprecedented repetition rates. These pulses are used for post-compression in a noble-gas-filled hollow-core fiber. Sub-30 fs pulses with energies of up to 540 μJ and a peak power of more than 11 GW at a repetition rate of 250 kHz (135 W) are achieved. Such laser systems could boost the achievable photon flux in high-harmonic generation and potentially foster novel experiments in multi-dimensional surface-science studies as well as coherent soft x-ray generation.

© 2013 Optical Society of America

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