3.1-kJ chirped-pulse power amplification in the LFEX laser

Abstract

The LFEX laser system is under construction to realize the principle of the fast ignition in the FIREX-I program. The 3.1-kJ output power of the chirped pulse has been obtained with the main disk amplifier. The 3.3-nm (FWHM) spectral width, which is enough wide for less than 2-ps rise time in pulse compression, was obtained by controlling the seed pulse both of temporally and spectrally with a spatial light modulation. The beam aberration with the main amplification was reduced to less than 0.2[03bb] rms in far field pattern by using two deformable mirrors in the main amplifier.