The spectral broadening performance of $1\mathrm{m}$ and $3\mathrm{m}$ long hollow fibers are compared. The $3\mathrm{m}$ capillary clearly outperforms the $1\mathrm{m}$ one in terms of both transmission and achievable spectral broadening. Starting from $1.1\mathrm{mJ}$ $71\mathrm{fs}$ pulses at $780\mathrm{nm}$ , a spectral broadening ratio of 26 was achieved using a single $3\mathrm{m}$ long argon-filled hollow fiber. After compression the measured pulse duration was $4.5\mathrm{fs}$ corresponding to a compression ratio of 16 at an energy of $0.42\mathrm{mJ}$ . Both the pulse duration and the pulse energy were limited by the applied chirped mirrors.

© 2011 Optical Society of America

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