50W, 50fs pulses from a fiber laser system using nonlinear fiber compression

摘要

We report on the generation of 50 fs pulses with an average output power of more than 50W. This is done by combining a high average power fiber CPA system with a microstructured large-mode-area fiber for nonlinear compression. The fiber CPA system delivers 300 fs pulses with a repetition rate of 73MHz in a linearly polarized beam with diffraction-limited quality. The average output power can exceed 100W. Nonlinear compression of these pulses is done by launching the light into a very short piece of a microstructured fiber and then removing the phase with a pair of chirped mirrors.