High-power ytterbium-doped fiber laser delivering few-cycle, carrier-envelope phase-stable 100 mJ pulses at 100 kHz

We present a carrier-envelope phase (CEP)-stable Yb-doped fiber laser system delivering 100 mJ few-cycle pulses at a repetition rate of 100 kHz. The CEP stability of the system when seeded by a carrier-envelope offset-locked oscillator is 360 mrad, as measured pulse-to-pulse with a stereographic above-threshold ionization (stereo-ATI) phase meter. Slow CEP fluctuations have been suppressed by implementing a feedback loop from the phase meter to the pulse picking acousto-optic modulator. To the best of our knowledge, this is the highest CEP stability achieved to date with a fiberbased, high-power few-cycle laser.