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Isolated attosecond pulses (IAPs), with durations approaching the natural timescale of electrons in materials, are tremendously valuable light sources for fundamental research and applications. An IAP is typically extracted by complicated gating methods from an attosecond pulse train that is produced by the high-harmonic generation (HHG) process [1]. Recently it was demonstrated that an intense 35-fs NIR pulse could be compressed down to sub-cycle duration in a kagomé-style hollow-core photonic crystal fiber (HC-PCF) filled with argon [2], where the on-axis intensity and duration of the compressed pulse are suitable for direct IAP generation. The high-frequency features of HHG by ultrashort driving fields have previously been theoretically studied [3,4]; here we investigate the more general features over the complete spectral range in the single-cycle limit.
© 2015 IEEE
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