Generating coherent broadband continuum soft-x-ray radiation by attosecond ionization gating

Thomas Pfeifer, Aurélie Jullien, Mark J. Abel, Phillip M. Nagel, Lukas Gallmann, Daniel M. Neumark, Stephen R. Leone
2007 Optics Express  
The current paradigm of isolated attosecond pulse production requires a few-cycle pulse as the driver for high-harmonic generation that has a cosine-like electric field stabilized with respect to the peak of the pulse envelope. Here, we present simulations and experimental evidence that the production of high-harmonic light can be restricted to one or a few cycles on the leading edge of a laser pulse by a gating mechanism that employs time-dependent ionization of the conversion medium. This
more » ... on medium. This scheme enables the generation of broadband and tunable attosecond pulses. Instead of fixing the carrier-envelope phase to produce a cosine driver pulse, the phase becomes a control parameter for the center frequency of the attosecond pulse. A method to assess the multiplicity of attosecond pulses in the pulse train is also presented. The results of our study suggest an avenue towards relaxing the requirement of few-cycle pulses for isolated attosecond pulse generation.
doi:10.1364/oe.15.017120 pmid:19551005 fatcat:nhdu5hivf5herijgfl562op4em