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We present a carrier-envelope offset (CEO) stable ytterbium-doped fiberchirped-pulse amplification system employing the technology of coherent beamcombining and delivering more than 1 kW of average power at a pulse repetitionrate of 80 MHz. The CEO stability of the system is 220 mrad rms, characterizedout-of-loop with an f-to-2f interferometer in a frequency offset range of 10 Hzto 20 MHz. The high-power amplification system boosts the average power of theCEO stable oscillator by five orders of magnitude while increasing the phasenoise by only 100 mrad. No evidence of CEO noise deterioration due to coherentbeam combining is found. Low-frequency CEO fluctuations at the chirped-pulseamplifier are suppressed by a slow loop feedback. To the best of our knowledge,this is the first demonstration of a coherently combined laser systemdelivering an outstanding average power and high CEO stability at the sametime.

Carrier-envelope offset stable, coherently combined ytterbium-doped fiber CPA delivering 1 kW of average power