Abstract
We demonstrated that a synthesized laser field consisting of an intense long ($45\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$, multi-optical-cycle) laser pulse and a weak short ($7\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$, few-optical-cycle) laser pulse can control the electron dynamics and high-order harmonic generation in argon, and generate extreme ultraviolet supercontinuum towards the production of a single strong attosecond pulse. The long pulse offers a large amplitude field, and the short pulse creates a temporally narrow enhancement of the laser field and a gate for the highest energy harmonic emission. This scheme paves the way to generate intense isolated attosecond pulses with strong multi-optical-cycle laser pulses.
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