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We demonstrate a High-Harmonic-Generation scheme which offers control overthe bandwidth of the spectral peaks. The scheme uses a vectorial two-colordriver with close central 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 odd-integer HHG peaks, the bandwidth of each beingproportional to the frequency difference between the two colors, to theharmonic order and inversely-proportional to the driver fields' ellipticities.Peak-broadening to the extent that a supercontinuum is formed is alsodemonstrated. This source will find use in HHG applications benefiting fromhigh-flux broadband extreme ultra-violet radiation, such as attosecondtransient absorption spectroscopy.

Controlling the Bandwidth of High Harmonic Emission Peaks with the Spectral Polarization of the Driver