Coherent Inc. has launched the Legend Elite CEP, a carrier envelope phase-stabilized Ti:sapphire amplifier. The system amplifies the ultrafast pulses generated by the proprietary Micra CEP oscillator up to the millijoule level of energy required for high harmonics generation, attosecond physics and coherent x-ray generation. It delivers pulse durations of <435 fs with a repetition rate of 1 kHz, and it has up to 4 W of average power and 4 mJ per pulse. Typical carrier envelope offset stability is better than 200 mrad. The regenerative amplifier includes an active feedback control to lock the phase velocity of the oscillating light field to the group velocity of the phase envelope. For ultrashort pulses consisting of only a few optical cycles, the peak of the oscillating electrical field can be maximized under the phase envelope.