Attosecond pulse generation in carbon K-edge region (284?eV) with sub-250?μJ driving laser using generalized double optical gating method

摘要

We studied attosecond pulse generation in the carbon K-edge region with generalized double optical gating, which provides a temporal gate for a near-infrared driving laser in high harmonic generation. Since the technique selectively generates the harmonics from the peak of driving laser field, the cutoff component is emphasized in the spectrum. Consequently, the harmonics was achieved up to 284?eV using a driving laser with sub-250?μJ pulse energy. The spectrum supported 20-as duration. The driving laser pulse energy is the lowest value ever reported for high harmonic generation in the carbon K-edge region.