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Spectral analysis and control to obtain sub- 5 fs pulses by femtosecond filamentation

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Abstract

A spectral-filter method is numerically demonstrated to obtain sub-5fs pulses by using femtosecond filamentation in fused silica. Instead of employing spectral phase compensation, by properly employing a high-pass filter to select the broadened high-frequency spectra that are located almost in phase in the tailing edge of the self-compressed pulses owing to self-steepening, as short as single-cycle pulses can be obtained. For instance, for an input pulse with a duration of 50fs and energy 2.2μJ, the minimum pulse duration can reach to 4fs (about 1.5  cycles) by applying a proper spectral filter.

© 2008 Optical Society of America

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