  An ultrafast laser delivering 10.4 kW average output power based on coherent
combination of twelve stepindex fiber amplifiers is presented. The system emits
close-to-transform-limited 254 fs pulses at 80 MHz repetition rate, has a high
beam quality (M2<=1.2), and a low relative intensity noise of 0.56% in the
frequency range of from 1 Hz to 1 MHz. Automated spatiotemporal alignment
allows for hands-off operation.
