High brilliance coherent light sources are sought for a diverse range of investigations and applications, e.g., ultrasensitive spectroscopy, standoff detection, chemical diagnostics, material science, ultrafast imaging and attosecond science. Here, we present such a carrier-envelope-phase stable light source, seeded by a mid-IR frequency comb, with simultaneous spectral coverage across 7 optical octaves, from the UV (340 nm) into the THz (40,000 nm). The brightness of this source exceeds the brightness of synchrotrons across the entire 7 octave spectrum and by up to 5 orders of magnitude.
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