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We demonstrate a High-Harmonic-Generation (HHG) scheme which offers controlof the bandwidth of the spectral peaks. The scheme uses a vectorial two-colordriver with close frequencies, generated by spectrally splitting alinearly-polarized input femtosecond-duration laser pulse and subsequentrecombining the two halves after their polarizations are made cross-ellipticaland counter-rotating. This results in the generation of new emission channelswhich coalesce into broad HHG peaks, the bandwidth of which increases withphoton energy. Liberated from complexities associated with the generation ofshort driver pulses, this source will find use in HHG applications benefitingfrom high-flux broadband extreme ultra-violet (XUV) radiation, such asattosecond transient absorption spectroscopy.

Controlling High Harmonic supercontinuum Generation with the spectral polarization of the driver