We report a diode pumped double-head multipassYb:KYW amplifier delivering up to 27 mJ pulses at a repetition rate of 100 Hz and a spectral bandwidth of 5.5 nm, centered at around 1030 nm. The amplified pulse bandwidth theoretically supports 340 fs pulses. First results on the study of a subsequent Yb:CaF2 power amplifier stage are also presented resulting 51 mJ at 20 Hz.

© 2012 Optical Society of America

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