Abstract

We report a detailed numerical study on the postcompression of high-energy ($\sim 30\hspace{0.17em}\mathrm{mJ}$) femtosecond laser pulses ($\sim 40\hspace{0.17em}\mathrm{fs}$), using the spectral broadening induced by optical-field ionization of a low-pressure helium gas in a capillary. Our numerical results are in very good agreement with previously published experimental data on spectral shapes, transmitted energies and recompressed pulse durations in the full range of laser energies and gas pressures investigated. Then, we calculate the performances of the method with shorter input pulses ($\sim 20\hspace{0.17em}\mathrm{fs}$) and demonstrate that few optical cycles recompressed pulses with 5 to 8.5 mJ energy could then be achieved.

©2012 Optical Society of America

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