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Generation of sub-5 fs pulses through cascade of filamentation and hollow fiber compression

A pulse-compression scheme based on cascade of filamentation and hollow fiber has been demonstrated. Pulses with duration of sub-5 fs and energy of 0.2 mJ near 800 nm have been generated by compressing the ∼ 40 fs pulses from a commercial laser system. This method is promising to generate near mono-cycle high energy pulses.