We demonstrate non-resonant optical control with bi-circular laser fields. Having the pump polarization simultaneously break time and space inversion symmetry allows for switching between K, K’ valleys of MoS2 even in its inversion symmetric bulk phase. This strong field effect enables a universal and material agnostic approach to valleytronics.
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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