We report on the generation of femtosecond pulses at with energies up to at repetition rate and sub-50-fs pulse duration. This pulse energy is a 1-order-of-magnitude improvement compared with previous sub-100-fs sources in this wavelength range. The pulses are generated by four-wave difference-frequency mixing process between the fundamental of a Ti:sapphire laser and its third harmonic in argon. Pulse duration measurements are achieved by pump–probe ionization of Xe gas providing the cross correlation between the fifth harmonic and the fundamental.
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