Abstract

We demonstrate a compact diode-pumped Yb:KGW femtosecond oscillator-Yb:YAG Innoslab amplifier master oscillator power amplifier (MOPA) with nearly transform-limited 636fs pulses at 620W average output power, 20MHz repetition rate, and beam quality of Mx2=1.43 and My2=1.35. By cascading two amplifiers, we attain an average output power of 1.1kW, a peak power of 80MW, and a 615fs pulse width in a single linearly polarized beam. The power-scalable MOPA is operated at room temperature, and no chirped-pulse amplification technique is used.

© 2010 Optical Society of America

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