All-fiber chirped-pulse amplification system generating 50 MW peak power 400 fs pulses at 1026 nm

We demonstrate an all-fiber chirped-pulse amplification system. In a stretching stage a specially designed triple-cladding fiber matching with a grating pair compressor allowed to stretch 6 ps 1026 nm pulses from master oscillator to ~500 ps was used. These pulses were amplified in a newly-developed extra-highly-Yb-doped large-mode area fiber up to ~10 W average power and then compressed in a transmission grating compressor down to 400 fs duration with resulted in a record-high 50 MW peak power.