Abstract

We have experimentally demonstrated pulses 0.4 mJ induration smaller than 12 fs with an excellent spatial beam profile byself-guided propagation in argon. The original 52 fs pulses from thechirped pulsed amplification laser system are first precompressed to32 fs by inserting an acoustic optical programmable dispersive filterinstrument into the laser system for spectrum reshaping and dispersioncompensation, and the pulse spectrum is subsequently broadened byfilamentation in an argon cell. By using chirped mirrors forpost-dispersion compensation, the pulses are successfully compressed tosmaller than 12 fs.

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