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We demonstrate a dramatic enhancement of the below-threshold harmonics in the vicinity of atomic resonances. The dependence on the driving laser carrier-envelope phase suggests a nonperturbative mechanism. Phase matching promises scalability to microJoule pulse energies.
Isolated attosecond pulses with continuum spectra extending below 15 eV are used to probe the sub-cycle energy shifts and splitting of helium excited states. Additionally, new absorption features appear far from the 1snp absorption lines.
Generalized Double Optical Gating is an effective scheme for generating single isolated attosecond pulses with multi-cycle driving lasers. It is to be implemented using a >100 mJ Ti:Sapphire laser to upscale the attosecond photon flux.
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