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Sub-25 fs pulses from a multipass amplifier system have been spectrally broadened in a hollow fiber up to 250 nm. Using a combination of a prism compressor and an improved acousto-optic programmable dispersive filter (AOPDF), we were able to compress the pulses close to their transform limit. Under optimized conditions we achieved pulses with a duration of 8 fs and a peak power up to 9 GW.
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Seres et al. (2003) studied this question.
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