Abstract
Generation of extreme ultraviolet supercontinuum in the plateau region of high-order harmonics has been demonstrated by shaping a fundamental-wave laser pulse with its second- and third-harmonic pulses. Such a Fourier synthesis of the optical waveforms could confine the harmonic emissions mainly in the center peak of the driving pulse, which suppresses those on other half-cycles efficiently, and as a consequence avoids or reduces spectral interference of harmonic emissions at different half-cycles, resulting in harmonic emissions free of interference within a certain spectral span in the frequency domain that forms supercontinuum in the high-order harmonic plateau region. This supercontinuum is significant for the efficient generation and further control of single attosecond pulses.
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