1 kW, 10 mJ, 120 fs coherently combined fiber CPA laser system

An ultrafast fiber chirped-pulse amplification laser system based on a coherent combination of 16 ytterbium-doped rod-type amplifiers is presented. It generates 10 mJ pulse energy at 1 kW average power and 120 fs pulse duration. A partially helium-protected, two-staged chirped-pulse amplification grating compressor is implemented to maintain the close to diffraction-limited beam quality by avoiding nonlinear absorption in air. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The research introduces an ultrafast fiber chirped-pulse amplification laser system based on 16 ytterbium-doped rod-type amplifiers, capable of generating high-energy, short-pulse lasers. By implementing helium protection and a two-stage chirped-pulse amplification method, the beam quality is maintained close to the diffraction limit.